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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Significant digits in a float?
Date: Thu, 01 May 2014 22:26:50 -0400
Organization: IISS Elusive Unicorn
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On Thu, 01 May 2014 21:55:20 +0100, Adam Funk <a24061@ducksburg.com>
declaimed the following:

>On 2014-05-01, Dennis Lee Bieber wrote:
>
>> On Tue, 29 Apr 2014 20:42:33 -0400, Roy Smith <roy@panix.com> declaimed the
>> following:
>>
>>>In article <mailman.9594.1398818045.18130.python-list@python.org>,
>>> Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:
>
>>>> (one reason slide-rules were acceptable for so long -- and even my high
>>>> school trig course only required slide-rule significance even though half
>>>> the class had scientific calculators [costing >$100, when a Sterling
>>>> slide-rule could still be had for <$10]) <G>
>>>
>>>Sterling?  Snort.  K&E was the way to go.
>>
>> 	Math teacher was selling them in my 10th grade... Actually I already
>> owned a Faber-Castell 57/22 "Business" ruler (which did NOT have the CF/DF
>> scales set for *PI) and a Pickett N-1010-ES Trig rule.
>
>What does a "business" slide-rule do?  Depreciation?
>

	Special markers for: dozen, gross; a scale for "non-metric measures" to
metric equivalents -- US Bushel, UK ("brit") bushel, US gallon, UK gallon,
short and long tons, a few Russian units, "Pud" and "R.t." which appear to
map to cubic inch and cubic foot; markings for % (discount and mark-up)

	And a scheme for simple interest calculations (which may explain why
the CF/DF scales are longer than the C/D scales): "Move the main cursor
line over the principal on scale DF -- the principal must be taken only on
scale DF -- set the rate per cent on the scale CI, under the short cursor
line, and read the interest on the scale DF or D in line with the number of
days on the scale CF or C." {yes, just to the left of the normal cursor is
a short line only over the inverted C scale}
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/