WWT Shows CLICK TO: Join and Support Internet Horology Club 185™ IHC185™ Forums

• Check Out Our... •
• TWO Book Offer! •
Go
New Topic
Find-Or-Search
Notify
Tools
Reply to Post
  
Strange stop watch "Click" to Login or Register 
posted
Hi all,
Anybody who knows what purpose this stop watch once had? It makes one revolution in 6 sec's and beats 50/sec. As can be seen it also has a split second's function. It looks as if it is from the 20's, and I suspect it once had a military use, of which I don't know anything.

 
Posts: 21 | Location: Stockholm, Sweden | Registered: August 30, 2003
Life Achievement
Military Expert
Picture of Greg Crockett
posted
Thanks for the image of your interesting stop-watch. I think the Semikrograph was made by BREITLING of GENEVE. This model is also found with German retailer's names on lower edge of the dial and a small script letter with a crown stamped into the center of the back, which indicates issue to German forces in World War One.

A stop watch identical to yours is pictured in Konrad Knirims book; Militäruhren / Military Timepieces 150 Years Watches and Clocks of German Forces:

quote:
http://home.t-online.de/home/konrad.knirim/


In correspondence with Mr. Knirim, we were unable to find the exact use of this timer by the forces of Germany. However, timers of this sort have been used for such things as aerial bomb timing, air navigation and testing munitions. Other scientific non-military applications are also possible. So far, I have only seen two Semikrographs and they were both German military issue.

Are there any little markings on the back of the case of your timer?

Best regards,
Greg
 
Posts: 1867 | Location: East Lansing, Michigan USA | Registered: November 24, 2002
posted
Greg,
thanx for answering! The ferrous case is marked "E&M 1453" on the back. Mvt is only marked with the pat. nr you see on the dial. No markings under the dial.
The chronograph mechanism is also quite unusual; it works as a stop watch, where the balance is halted. In order to get the balance with its very heavy hair spring started again after stopping, there are TWO arms working in succession on the serrated edge of the balance. Otherwise the chrono mech looks like a normal chronograph, as opposed to a stop watch.
 
Posts: 21 | Location: Stockholm, Sweden | Registered: August 30, 2003
posted
Are there any patent literature experts in the chapter? Is the symbol on the dial after the text "Pat." a mark to indicate Swiss patent 73392 from 1893?
 
Posts: 676 | Location: Oak Ridge, Tennessee USA | Registered: December 08, 2002
  Powered by Social Strata  
 


©2002-2021 Internet Horology Club 185™ - Lindell V. Riddle President - All Rights Reserved Worldwide

Internet Horology Club 185™ is the "Family-Friendly" place for Watch and Clock Collectors