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Groups > it.comp.retrocomputing > #47651
| From | zfkirone <zfkirone@gmail.com> |
|---|---|
| Newsgroups | it.comp.retrocomputing |
| Subject | Re: (Quasi OT) orologio IBM 1939 |
| Date | 2016-05-10 07:12 +0200 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <ngsrtt$75q$1@gioia.aioe.org> (permalink) |
| References | (3 earlier) <2no2gb92r2tfh9tuvr2poua6ri5e8vv0en@4ax.com> <nds0tf$r9j$1@gioia.aioe.org> <3gn6gbtml0do190aet4l7d2otdmsjhnbcu@4ax.com> <ne18a5$1dje$1@gioia.aioe.org> <f7kfgb1bbdpokeufcpjhp68aflehpj3qj9@4ax.com> |
Aneddoto pescato qui: http://thedailywtf.com/articles/comments/that-70-s-paper-mill Riporto l'intero intervento: --------- BEGIN QUOTE --------- Herby (unregistered) 2016-05-09 The time: the 50's (yes, that long ago!). The place: A school with "Master clock" system. What happened: About once a week, the clocks were all screwy when the students came in at the start of the day. Why? It seems that the clocks all need to be timed and synchronized to a central "master clock" (before 1956, it was a product of none other than IBM!). Every hour the master clock would emit a tone on the AC line that the clocks were plugged into that would lock the minute hand to the second one and for the last minute of the hour it would sync all the clocks together (minute wise). In addition a different tone would be used for the hour hand at midnight and noon just to make things pretty. Now you have one of those nasty floor polishers that is old and weary, and it generates LOTS of electrical noise that happens to coincide with the hour hand clock frequency and the clock hands go wild. This is because the janitorial people cleaned up, and their tasks took them into the small hours of the morning. Caused quite a consternation when the students came in only to find the clocks (only some of them) having wrong hours, only to be reset at noon when the "real" signal came about. So cleaning people can (and have) been screwing things up for some time! --------- END QUOTE --------- CYA
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(Quasi OT) orologio IBM 1939 "massivan" <nstlva@tin.it> - 2016-04-01 00:44 +0200
Re: (Quasi OT) orologio IBM 1939 "fm" <fm@fm.it> - 2016-04-02 09:26 +0200
Re: (Quasi OT) orologio IBM 1939 AleX <spammenograzie@NOSPAMlibero.it> - 2016-04-02 12:24 +0000
Re: (Quasi OT) orologio IBM 1939 G. <gerry77@no.spam.mail.com> - 2016-04-03 20:45 +0200
Re: (Quasi OT) orologio IBM 1939 AleX <spammenograzie@NOSPAMlibero.it> - 2016-04-03 21:11 +0000
Re: (Quasi OT) orologio IBM 1939 G. <gerry77@no.spam.mail.com> - 2016-04-05 09:24 +0200
Re: (Quasi OT) orologio IBM 1939 AleX <spammenograzie@NOSPAMlibero.it> - 2016-04-05 20:48 +0000
Re: (Quasi OT) orologio IBM 1939 G. <gerry77@no.spam.mail.com> - 2016-04-09 18:12 +0200
Re: (Quasi OT) orologio IBM 1939 AleX <spammenograzie@NOSPAMlibero.it> - 2016-04-10 14:13 +0000
Re: (Quasi OT) orologio IBM 1939 zfkirone <zfkirone@gmail.com> - 2016-05-10 07:12 +0200
Re: (Quasi OT) orologio IBM 1939 "massivan" <nstlva@tin.it> - 2016-04-03 20:18 +0200
Re: (Quasi OT) orologio IBM 1939 "massivan" <nstlva@tin.it> - 2016-04-03 20:27 +0200
Re: (Quasi OT) orologio IBM 1939 "fm" <fm@fm.it> - 2016-04-06 18:31 +0200
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