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Re: [CBQ] Re: Watches

To: <CBQ@yahoogroups.com>
Subject: Re: [CBQ] Re: Watches
From: "Rupert & Maureen" <gamlenz@ihug.co.nz>
Date: Sat, 31 Jul 2010 06:52:09 +1200
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Glen

Thanks for the "isochronism" comment.  I was thinking in terms of lack of 
variation over a much longer period.

Rupert

----- Original Message ----- 
From: "glen brewer" <gbrewer@yahoo.com>
To: <CBQ@yahoogroups.com>
Sent: Friday, July 30, 2010 10:11 PM
Subject: [CBQ] Re: Watches


>A railroad man's watch was a precision tool, a requirement for employment and 
>a big investment. Buying one before reporting for 
>work the first day must have been quite a strain on finances.
>
> Specifications for US RR watches varied a bit over the years and from road to 
> road, but by mid 20th century were pretty much: US 
> made, lever set, size 16, plain open face, wind at 12, arabic numerals, at 
> least 21 jewels, Brequet hairspring, double roller, 
> micrometer regulator, adjusted to temperature, isochronism, and at least 5 
> positions. Most railroads by then simply listed 
> acceptable makes and models.
>
> See my story, Grandfather's Watch, here: 
> http://www.railroadphotoessays.com/f...read.php?t=986
> As I said, standards changed over time: Grandfather's 19 jewel Burlington was 
> acceptable at the time he bought it.
>
> More practically defined, isochronism refers to the watch rate variation of a 
> tightly wound main spring as compared to one mostly 
> wound down.
>
> Glen Brewer
> 



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