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1957 LED

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  1957 LED hancock4@bbs.cpcn.com - 2015-12-10 11:03 -0800
    Re: 1957 LED Al Kossow <aek@bitsavers.org> - 2015-12-10 11:06 -0800
      Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 14:44 -0500
        Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 07:41 -0800
          Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 16:37 +0000
          Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:42 -0500
      Re: 1957 LED philo <philo@privacy.net> - 2015-12-10 13:56 -0600
        Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 22:59 -0500
          Re: 1957 LED "Osmium" <r124c4u102@comcast.net> - 2015-12-11 08:20 -0600
            Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:33 -0500
        Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:58 -0800
          Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-13 13:00 -0500
        Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:48 -0700
          Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-14 09:07 +0000
            Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-14 11:47 -0500
            Re: 1957 LED rpw3@rpw3.org (Rob Warnock) - 2015-12-16 14:55 +0000
              Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-16 16:32 +0000
                Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-16 14:17 -0500
                Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-16 18:15 -0600
                  Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-17 07:58 +0000
                  Re: 1957 LED Andrew Swallow <am.swallow@btinternet.com> - 2015-12-17 13:21 +0000
          Re: 1957 LED Ingo Paschke <ipaschke@lpclabs.de> - 2015-12-14 11:11 +0100
      Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-11 10:58 +0000
        Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:50 -0700
          Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-14 12:57 +0000
            Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-14 14:07 +0000
              Re: 1957 LED Stephen Wolstenholme <steve@easynn.com> - 2015-12-14 14:33 +0000
      Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 07:31 -0800
        Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:42 -0800
          Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-14 09:39 +0000
          Re: 1957 LED Jon Elson <jmelson@wustl.edu> - 2015-12-14 17:07 -0600
            Re: 1957 LED Alfred Falk <falk@arc.ab.ca> - 2015-12-15 18:53 +0000
              Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-15 15:05 -0500
                Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-16 07:32 -0800
                  Re: 1957 LED Alfred Falk <falk@arc.ab.ca> - 2015-12-16 17:23 +0000
                  Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-16 14:23 -0500
                    Re: 1957 LED Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-12-16 20:13 +0000
                      Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-16 13:15 -0800
                      Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-17 14:53 -0500
                        Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-17 14:17 -0600
                          Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-18 19:43 -0500
                            Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-20 20:02 -0600
                            Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-21 10:31 -0800
                              Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-21 14:53 -0500
                                Re: 1957 LED mausg@mail.com - 2015-12-21 20:27 +0000
                    Re: 1957 LED Uncle Steve <stevet810@gmail.com> - 2015-12-17 18:48 -0500
            Re: 1957 LED davidmylastname@acm.org (David Griffith) - 2015-12-16 02:43 +0000
            Re: 1957 LED Mike Spencer <mds@bogus.nodomain.nowhere> - 2015-12-16 17:44 -0400
    Re: 1957 LED scott@slp53.sl.home (Scott Lurndal) - 2015-12-10 19:13 +0000
      Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-10 20:17 +0000
        Re: 1957 LED Lawrence Statton <lawrence@sengiuo.mx> - 2015-12-10 17:10 -0600
        Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-10 23:00 -0500
          Re: 1957 LED isw <isw@witzend.com> - 2015-12-10 21:21 -0800
            Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-11 08:01 +0000
              Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:30 -0500
              Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:36 -0600
                Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-12 07:55 +0000
                  Re: 1957 LED mausg@mail.com - 2015-12-12 11:20 +0000
                    Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-12 15:39 +0000
                    Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-12 10:50 -0500
                      Re: 1957 LED Stan Barr <plan.b@bluesomatic.org> - 2015-12-13 08:00 +0000
                        Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-13 11:10 +0000
                Re: 1957 LED Lon <lon.stowell@comcast.net> - 2015-12-13 12:51 -0700
          Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-11 10:59 +0000
            Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 15:46 +0000
              Re: 1957 LED "gareth" <no.spam@thank.you.invalid> - 2015-12-11 17:37 +0000
                Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-11 18:34 +0000
                  Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 14:49 -0500
                  Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:39 -0600
                    Re: 1957 LED Bob Eager <news0005@eager.cx> - 2015-12-11 22:46 +0000
                    Re: 1957 LED Michael Black <et472@ncf.ca> - 2015-12-11 19:07 -0500
                      Re: 1957 LED Bob Eager <news0005@eager.cx> - 2015-12-12 01:04 +0000
                      Re: 1957 LED Ahem A Rivet's Shot <steveo@eircom.net> - 2015-12-12 08:54 +0000
          Re: 1957 LED hancock4@bbs.cpcn.com - 2015-12-11 11:52 -0800
            Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:46 -0600
              Re: 1957 LED Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-12-11 22:56 +0000
          Re: 1957 LED "Charles Richmond" <numerist@aquaporin4.com> - 2015-12-11 15:35 -0600
          Re: 1957 LED Quadibloc <jsavard@ecn.ab.ca> - 2015-12-13 07:51 -0800
    Re: 1957 LED Lawrence Statton <lawrence@senguio.mx> - 2015-12-10 17:09 -0600

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#154971 — 1957 LED

Sylvania ran an ad for its LED back in 1957, called a photo diode.
It was in C&A 09-1957, pg 19.

specs:

TABLE OF RATINGS & CHARACTERISTICS
Absolute Maximum Ratings (at 25°C):
Operating ,Voltage * * * * * * * * * * * * * 50 volts dc
Ambient Temperature (Maximum) ****** 75°C
Power Dissipation ** << * * * * * * * * * * 40 Milliwatts
Forward Current * * * * * * * * * * * * * 10 Ma dc
CHARACTERISTICS 1
Reverse Current--Dark (ER= -10 volts} *** 15 ua max. I
Reverse Current-Dark (ER= -50 volts) *** 100 UI max. j
Noise Voltage--Dark (ER>;= -45 volts, , ~'
Rl=lOO,OOO ohms) * 15 Millivolts max. '
light Sensitivity ******** 18.7 peak.to·peak,volts-min:
light Sensitivity. * * * * * ** 37.5 peak.lo-peak volts-max.
Typical Minimum Frequency Response. * * .,15.0 KC


Sylvania, leader in diode development, introduces the
IN77B, a new smaller junction photo diode with superior
power dissipation and higher temperature capabilities.
The improved unit, with a diameter of .077 inch, is ideal
for highly compact assemblies and other applications
where space is at a premium. The new IN77B, which
replaces type IN77A, is now available at substantially
lower prices in volume quantities.

The compact construction and fast response of the
Sylvania IN77B make it ideal for rapid, highly sensitive·
scanning and reading applications, such as in computer
tape or punched cards readout. The new unit is also readily
adaptable to infrared detection and heat-seeking devices
because it is sensitive to light wave lengths extending
from near ultraviolet into infrared. Other applications
for the new 1N77B include liquid level control, headlight
and street light dimmers, intensity controls" photoelectric
controls and motion picture sound pickup.

Sylvania's improved photodiode has a higher lumen
intensity than other types and a high output impedance.
This is especially advantageous when coupling into
vacuum tube or grounded collector transistor circuits.
The new units are hermetically sealed in glass with a
built-in lens that focuses light on the sensitive portion of
the junction. The light interruption frequency response
of the 1N77B photodiode is flat from 300 cycles to 15 kc
at 100 percent with 260 lumens/sq. ft.; RL ... 110,000
ohms, -45 v.

Contact your Sylvania representative for further in·
formation on the new 1N77B.

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#154972

On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
> Sylvania ran an ad for its LED back in 1957, called a photo diode.


This is a light detector, not a light generator.

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#154978

On Thu, 10 Dec 2015, Al Kossow wrote:

> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>
>
> This is a light detector, not a light generator.
>
>
>
Yes, but I gather LEDs existed for a decent time before they were 
practical.

But I can't remember where I came across that, and what I thought was an 
early reference isn't, it was mostly concurrent with the arrival on the 
market of LEDs.

   Michael

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#155031

On Thursday, December 10, 2015 at 2:41:17 PM UTC-5, Michael Black wrote:

> Yes, but I gather LEDs existed for a decent time before they were 
> practical.

Lots of technology was like that, and would languish for years.
Sometimes a breakthrough was needed in manufacturing to bring
the cost down; other times it was a wait for a need.

I believe it took several years for Edison to improve his
incandescent light bulb to be workable in everyday service
in quantity.  (Of course, he also needed to improve his
power systems from the initial prototype.)

For instance, I believe the technology for the high quality 
"condenser microphone" used in performances was discovered many, many
years prior to its deployment.


> But I can't remember where I came across that, and what I thought was an 
> early reference isn't, it was mostly concurrent with the arrival on the 
> market of LEDs.

Previously posted here was an excerpt from a Bell Labs report
on deployment of LEDs.  In the mid 1970s they began to deploy
them as indicator lights within telephone sets instead of 
incandescent lamps.  I think a big reason was that they lasted
longer, which would save a Bell technician from making a service
call, back in the days when stuff was all rented and they were
responsible for all maintenance.  Applications included the
line-in-use indicator in keysets, and the dial illuminator in
Trimline and Princess phones.

It's curious in that while LED's may have become cost practical
in the 1970s for electronic devices, it took until recently for
them to be cost practical in bright lighting such as streetlights
and flashlights.

(SEPTA replaced coach vestibule incandescent lamps with LEDs a 
few years ago, which give off better light.  Now, locomotives
even have LED headlights, which are extremely bright.)

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#155039

On Fri, 11 Dec 2015 07:41:09 -0800 (PST)
hancock4@bbs.cpcn.com wrote:

> It's curious in that while LED's may have become cost practical
> in the 1970s for electronic devices, it took until recently for
> them to be cost practical in bright lighting such as streetlights
> and flashlights.

	The use for indicator lamps did not require efficiency, they could
be much less efficient than a small incandescent (quite hard that) and still
be fine if they outlasted the equipment they went in (thus saving holders
and replacement costs). There was also no worry about available colours,
using what was available and cheap was fine - for a long time everything
glowed in little red dots.

	Illumination OTOH is sensitive to efficiency and colour, the latter
may be sacrificed for the former sometimes (sodium street lights for
example) but for most purposes a half decent white light is essential and
it was a long time before LEDs got past green. Getting to blue in the 1990s
netted the inventors a Nobel prize (in 2014).

	White LEDs, like the ones that illuminate my house, are actually
blue LEDs pumping a phosphor that emits a reddish yellow light.

	Then there was the little matter of efficiency - which by the time
we had white LEDs was really important and the bar was way up - as good as
an incandescent was nowhere near good enough, the target was a CFL at four
times the efficiency of an incandescent. That was reached a few years ago,
and now the best LEDs are surpassing even HID for efficiency, while LEDs
better than CFLs are cheap.

	Whatever lighting technology displaces LEDs will have a hard act to
follow, I look foreward to seeing it.

-- 
Steve O'Hara-Smith                          |   Directable Mirror Arrays
C:>WIN                                      | A better way to focus the sun
The computer obeys and wins.                |    licences available see
You lose and Bill collects.                 |    http://www.sohara.org/

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#155054

On Fri, 11 Dec 2015, hancock4@bbs.cpcn.com wrote:

> On Thursday, December 10, 2015 at 2:41:17 PM UTC-5, Michael Black wrote:
>
>> Yes, but I gather LEDs existed for a decent time before they were
>> practical.
>
> Lots of technology was like that, and would languish for years.
> Sometimes a breakthrough was needed in manufacturing to bring
> the cost down; other times it was a wait for a need.
>
> I believe it took several years for Edison to improve his
> incandescent light bulb to be workable in everyday service
> in quantity.  (Of course, he also needed to improve his
> power systems from the initial prototype.)
>
> For instance, I believe the technology for the high quality
> "condenser microphone" used in performances was discovered many, many
> years prior to its deployment.
>
>
>> But I can't remember where I came across that, and what I thought was an
>> early reference isn't, it was mostly concurrent with the arrival on the
>> market of LEDs.
>
> Previously posted here was an excerpt from a Bell Labs report
> on deployment of LEDs.  In the mid 1970s they began to deploy
> them as indicator lights within telephone sets instead of
> incandescent lamps.  I think a big reason was that they lasted
> longer, which would save a Bell technician from making a service
> call, back in the days when stuff was all rented and they were
> responsible for all maintenance.  Applications included the
> line-in-use indicator in keysets, and the dial illuminator in
> Trimline and Princess phones.
>
> It's curious in that while LED's may have become cost practical
> in the 1970s for electronic devices, it took until recently for
> them to be cost practical in bright lighting such as streetlights
> and flashlights.
>
LEDs were relatively weak light output for a long time.  I think it was 
the late eighties or early nineties that you could buy at hobby levels 
"bright" LEDs.  Each color uses a different semiconductor to produce the 
color, and after red, green, orange and yellow came about (maybe the 
latter two were the same, with different filtering?), there was a pause 
before blue and then white arrived.  SO perhaps the process of trying to 
find what would work for white caused improvements elsewhere.

Or maybe it was because for a lot of uses, bright colored lights aren't so 
useful. So nobody bothered until there was white, but that's speculation.

Yes, now you can get Christmas lights in all kinds of colors and traffic 
lights, but maybe nobody thought of that, they saw the goal as  strong 
output white LEDs?

   Michael

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#154982

On 12/10/2015 01:06 PM, Al Kossow wrote:
> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>
>
> This is a light detector, not a light generator.
>
>



LED was invented in 1962

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#155003

On Thu, 10 Dec 2015, philo wrote:

> On 12/10/2015 01:06 PM, Al Kossow wrote:
>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>> 
>> 
>> This is a light detector, not a light generator.
>> 
>> 
>
>
>
> LED was invented in 1962
>
That sounds right.  I got my first 7segment readouts in 1974, they'd been 
out for some years then but the cost was high initially.

   Michael

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#155021

"Michael Black" wrote:

> On Thu, 10 Dec 2015, philo wrote:
>
>> On 12/10/2015 01:06 PM, Al Kossow wrote:
>>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>>>
>>>
>>> This is a light detector, not a light generator.
>>>
>>>
>>
>>
>>
>> LED was invented in 1962
>>
> That sounds right.  I got my first 7segment readouts in 1974, they'd been 
> out for some years then but the cost was high initially.

The Bowmar calculator dates to the fall of 1971 per Google, which fits in 
OK.. 

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#155053

On Fri, 11 Dec 2015, Osmium wrote:

> "Michael Black" wrote:
>
>> On Thu, 10 Dec 2015, philo wrote:
>> 
>>> On 12/10/2015 01:06 PM, Al Kossow wrote:
>>>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>>>> 
>>>> 
>>>> This is a light detector, not a light generator.
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> LED was invented in 1962
>>> 
>> That sounds right.  I got my first 7segment readouts in 1974, they'd been 
>> out for some years then but the cost was high initially.
>
> The Bowmar calculator dates to the fall of 1971 per Google, which fits in 
> OK.. 
>
Yes, there was a slow buildup.  Being able to get cheap readouts in 1974 
was just a marker, they'd have to have been available for some time in 
order to get that cheap, I think I paid a dollar each.

But I'm not sure how much earlier they were being used.  Maybe 1969, but 
I'm not sure why I pick that year.

   Michael

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#155148

On Thursday, December 10, 2015 at 12:56:36 PM UTC-7, philo wrote:

> LED was invented in 1962

I looked things up...

The first visible light LEDs were invented by Nick Holonyak at GE in 1962, but 
they were still curiosities - GE sold them, but at $260 each.

The first LED that was a successful commercial product was produced by Monsanto in 1970:

http://www.lamptech.co.uk/Spec%20Sheets/LED%20Monsanto%20MV1.htm

John Savard

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#155152

On Sun, 13 Dec 2015, Quadibloc wrote:

> On Thursday, December 10, 2015 at 12:56:36 PM UTC-7, philo wrote:
>
>> LED was invented in 1962
>
> I looked things up...
>
> The first visible light LEDs were invented by Nick Holonyak at GE in 1962, but
> they were still curiosities - GE sold them, but at $260 each.
>
> The first LED that was a successful commercial product was produced by Monsanto in 1970:
>
> http://www.lamptech.co.uk/Spec%20Sheets/LED%20Monsanto%20MV1.htm
>
> John Savard
>
THat's about what wikipedia says.

I was hoping I could remember where I had these bits of facts from.  I 
must have seen (after the fact) an old magazine that had some notice of 
the LED, because I do remember thinking it took it's time to become 
viable.

1970 sounds about right for being "cheap and available".  You probably 
don't see many projects before that with LEDs (if any) but it's right on
the cusp.

   Michael

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#155155

On 12/10/2015 12:56, philo wrote:
> On 12/10/2015 01:06 PM, Al Kossow wrote:
>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>>
>>
>> This is a light detector, not a light generator.
>>
>>
>
>
>
> LED was invented in 1962

? By whom, and from what discovery?   May have been when someone did 
some sort of press release, etc.

Long before then, some of the old plastic transistors that didn't have 
enough opaqueness in their cladding were discovered to be quite 
photosensitive, leading to photodetector transistors.

For leds, don't recall the source, but one of the engineering mags had 
reported on the ability to generate photons in diodes--unfortunately 
don't recall if they were in the visible spectrum either.

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#155166

On Sun, 13 Dec 2015 12:48:27 -0700, Lon <lon.stowell@comcast.net> wrote:
> On 12/10/2015 12:56, philo wrote:
>> On 12/10/2015 01:06 PM, Al Kossow wrote:
>>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>>>
>>>
>>> This is a light detector, not a light generator.
>>>
>>>
>>
>>
>>
>> LED was invented in 1962
>
> ? By whom, and from what discovery?   May have been when someone did 
> some sort of press release, etc.

H J Round, working for Marconi, noticed some of his diode detectors
emitting light and reported it in 1907-ish,  The Russians did some
work on carborundum LEDs in the 1920s-1930s IIRC.
Whether any of this info made it online, I don't know...

-- 
Stan Barr     plan.b@bluesomatic.org

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#155180

On Mon, 14 Dec 2015, Stan Barr wrote:

> On Sun, 13 Dec 2015 12:48:27 -0700, Lon <lon.stowell@comcast.net> wrote:
>> On 12/10/2015 12:56, philo wrote:
>>> On 12/10/2015 01:06 PM, Al Kossow wrote:
>>>> On 12/10/15 11:03 AM, hancock4@bbs.cpcn.com wrote:
>>>>> Sylvania ran an ad for its LED back in 1957, called a photo diode.
>>>>
>>>>
>>>> This is a light detector, not a light generator.
>>>>
>>>>
>>>
>>>
>>>
>>> LED was invented in 1962
>>
>> ? By whom, and from what discovery?   May have been when someone did
>> some sort of press release, etc.
>
> H J Round, working for Marconi, noticed some of his diode detectors
> emitting light and reported it in 1907-ish,  The Russians did some
> work on carborundum LEDs in the 1920s-1930s IIRC.
> Whether any of this info made it online, I don't know...
>
That does sound familiar.

I have seen talk of early "transistors", but I do have a vaguer memory
of light emitting things like you just posted.  Real light, not "flames 
before it burned itself out".

SOmetimes that stuff was accidental, but I think there were also cases 
(certainly with early "transistors" that they couldn't replicate things, 
so probably other things needed to advance to make them feasible.

There is a book, I've mentioned it here before, about the development of 
Radar during WWII, which entailed pushing frequency limits up, and 
building things at higher and higher frequencies.  They had problems with 
receivers, so they went back to "cat's whisker" detectors, which resulted 
in those early semiconductor diodes like the 1N21.  And that seems to have 
set the stage for such diodes after the war, like the 1N23, and moved 
things forward so it was time for Bell to "develop" the transistor.

People forget early technology, so it becomes a footnote in a textbook, or 
a garbled explanation of someone else's explanation.  If you go back to 
the source, and build on that, rather than building on layers that came 
later, you may have a chance to move things further.

   Michael

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#155254

Stan Barr  <plan.b@bluesomatic.org> wrote:
+---------------
| H J Round, working for Marconi, noticed some of his diode detectors
| emitting light and reported it in 1907-ish,  The Russians did some
| work on carborundum LEDs in the 1920s-1930s IIRC.
| Whether any of this info made it online, I don't know...
+---------------

Here:

    https://en.wikipedia.org/wiki/Light-emitting_diode#Discoveries_and_early_devices
    ...
    Electroluminescence as a phenomenon was discovered in 1907 by
    the British experimenter H. J. Round of Marconi Labs, using
    a crystal of silicon carbide and a cat's-whisker detector.
    Soviet inventor Oleg Losev reported creation of the first LED
    in 1927. His research was distributed in Soviet, German and
    British scientific journals, but no practical use was made of
    the discovery for several decades.


-Rob

-----
Rob Warnock		<rpw3@rpw3.org>
627 26th Avenue		<http://rpw3.org/>
San Mateo, CA 94403

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#155257

On 16 Dec 2015 14:55:15 GMT, Rob Warnock <rpw3@rpw3.org> wrote:
> Stan Barr  <plan.b@bluesomatic.org> wrote:
> +---------------
>| H J Round, working for Marconi, noticed some of his diode detectors
>| emitting light and reported it in 1907-ish,  The Russians did some
>| work on carborundum LEDs in the 1920s-1930s IIRC.
>| Whether any of this info made it online, I don't know...
> +---------------
>
> Here:
>
>     https://en.wikipedia.org/wiki/Light-emitting_diode#Discoveries
>     _and_early_devices
>     ...
>     Electroluminescence as a phenomenon was discovered in 1907 by
>     the British experimenter H. J. Round of Marconi Labs, using
>     a crystal of silicon carbide and a cat's-whisker detector.
>     Soviet inventor Oleg Losev reported creation of the first LED
>     in 1927. His research was distributed in Soviet, German and
>     British scientific journals, but no practical use was made of
>     the discovery for several decades.

Thanks for that...my faith(?) in wikipedia is somewhat restored :-)

I'm alway surprised at how much is *not* on the web: earlier this year
I was researching my grandfather's regiment (the Devonshires) in WW1
and found very little info.  However I did turn up a 2-volume
official history in dead-tree format which I bought!

-- 
Stan Barr     plan.b@bluesomatic.org

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#155265

On Wed, 16 Dec 2015, Stan Barr wrote:

> On 16 Dec 2015 14:55:15 GMT, Rob Warnock <rpw3@rpw3.org> wrote:
>> Stan Barr  <plan.b@bluesomatic.org> wrote:
>> +---------------
>> | H J Round, working for Marconi, noticed some of his diode detectors
>> | emitting light and reported it in 1907-ish,  The Russians did some
>> | work on carborundum LEDs in the 1920s-1930s IIRC.
>> | Whether any of this info made it online, I don't know...
>> +---------------
>>
>> Here:
>>
>>     https://en.wikipedia.org/wiki/Light-emitting_diode#Discoveries
>>     _and_early_devices
>>     ...
>>     Electroluminescence as a phenomenon was discovered in 1907 by
>>     the British experimenter H. J. Round of Marconi Labs, using
>>     a crystal of silicon carbide and a cat's-whisker detector.
>>     Soviet inventor Oleg Losev reported creation of the first LED
>>     in 1927. His research was distributed in Soviet, German and
>>     British scientific journals, but no practical use was made of
>>     the discovery for several decades.
>
> Thanks for that...my faith(?) in wikipedia is somewhat restored :-)
>
> I'm alway surprised at how much is *not* on the web: earlier this year
> I was researching my grandfather's regiment (the Devonshires) in WW1
> and found very little info.  However I did turn up a 2-volume
> official history in dead-tree format which I bought!
>
It's so much trouble to digitize (I salute those who do it), that it's 
easier to put more recent things online, those that started out in digital 
format.

About 1982 my mother's cousin was interested in geneology, and did a 
family tree of my father's side.  I didn't pay much attention, but I never 
came across much in looking at random but almost relevant books.  Though 
one time I was at someone's house and there was a random copy of a history 
magazine, and there was my great, great, great grandmother.

But then about 2009, I started looking, and there is a whole lot of stuff 
online.  It boggles my mind.  Of course, some of it is that someone had 
looked at old letters and published them at one point (historical 
societies), and then those same or later historical societies have put the 
material online.  I can't imagine this stuff being readily available 
unless I'd gone physically to Winnipeg where it's "local history".

I even found out something via "google books", something showing up in a 
search so I knew to get the book.

   Michael

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#155276

"Stan Barr" <plan.b@bluesomatic.org> wrote in message 
news:slrnn734g8.2ju.plan.b@ID-309335.user.uni-berlin.de...
> On 16 Dec 2015 14:55:15 GMT, Rob Warnock <rpw3@rpw3.org> wrote:
>> Stan Barr  <plan.b@bluesomatic.org> wrote:
>> +---------------
>>| H J Round, working for Marconi, noticed some of his diode detectors
>>| emitting light and reported it in 1907-ish,  The Russians did some
>>| work on carborundum LEDs in the 1920s-1930s IIRC.
>>| Whether any of this info made it online, I don't know...
>> +---------------
>>
>> Here:
>>
>>     https://en.wikipedia.org/wiki/Light-emitting_diode#Discoveries
>>     _and_early_devices
>>     ...
>>     Electroluminescence as a phenomenon was discovered in 1907 by
>>     the British experimenter H. J. Round of Marconi Labs, using
>>     a crystal of silicon carbide and a cat's-whisker detector.
>>     Soviet inventor Oleg Losev reported creation of the first LED
>>     in 1927. His research was distributed in Soviet, German and
>>     British scientific journals, but no practical use was made of
>>     the discovery for several decades.
>
> Thanks for that...my faith(?) in wikipedia is somewhat restored :-)
>
> I'm alway surprised at how much is *not* on the web: earlier this year
> I was researching my grandfather's regiment (the Devonshires) in WW1
> and found very little info.  However I did turn up a 2-volume
> official history in dead-tree format which I bought!
>

Stan, you can join Wikipedia as an author (for the fantastic sum of $0 US) 
and write your own page on the Devonshires.  You'll just have to "study up" 
and learn a little about how Wikipedia structures their pages.  Wikipedia is 
overly fond of references, so it's good you have the "dead tree" version to 
site.

--

numerist at aquaporin4 dot com

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#155279

On Wed, 16 Dec 2015 18:15:42 -0600, Charles Richmond 
<numerist@aquaporin4.com> wrote:
>
> Stan, you can join Wikipedia as an author (for the fantastic sum of $0 US) 
> and write your own page on the Devonshires.  You'll just have to "study up" 
> and learn a little about how Wikipedia structures their pages.  Wikipedia is 
> overly fond of references, so it's good you have the "dead tree" version to 
> site.

I might do that eventually.   My sister did most of the research on
our family, but she passed away a year ago and she had no sense of
organization, especially on a computer!  We're slowly getting things
tidied up...

-- 
Stan Barr     plan.b@bluesomatic.org

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