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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