12/17/2023 0 Comments Watch timepiece 1910s us![]() There are ads from the early part of the war for watches to be "volunteered" for military service. One of my examples is a Jurgenson pocket chronometer with spring detent escapement mounted in a weighted tub with gimbals. I know they did this with many pocket watches as well. Roth and the others may also have taken some 37 size 7 jewel movements and mounted them in gimbals after the upgrade. I believe most of those were done by Roth Brothers in New York but I am sure there were other contractors as well. They never offered the flat timepieces that one sees in the upgrades. Waltham sold the 37 size in two chronometer forms and a very similar counter top regulator for jewelry stores. They were needed while Hamilton was tooling up production for the model 22 (which was more robust and easier to service). Paris Universal Exposition, 1867, Reports of the United States Commissioners: General Survey of the Exhibition (Washington, 1868), Class 23: Clock and Watch. and used for merchant and possibly military service. ![]() When the supply of timepieces was a problem in WWII many of the folding clocks were upgraded to 15 jewels, etc. ![]() as described in the presentation I have posted in Timely Topics. The movement was then adapted to many other applications from car clocks to miniature banjo clocks, folding travel clocks etc. the original 37 size design was the 15 jewel adjusted movement with diamond end stones on the balance and micrometer regulator. The real requirement is to be able to determine the time at Greenwich within 20 seconds at the end of a transatlantic voyage having set it with an accurate regulator at the beginning of the trip and adjusting the readings for temperature variation and rate if necessary.Īctually the chronometers were not upgraded, they were downgraded. A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ships position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies. I am perfectly comfortable calling the Waltham 37 size chronometers by that name and would, in fact, trust one for any navigation task once it had been properly serviced and the rate noted. The question then becomes, "how far?" In the mid 19th century it was not uncommon for high grade pocket watches to be employed for navigation and there were reports of a duplex being used to navigate most of the Atlantic and making port in New York when an accident took out the original ship's chronometer. I believe the way Waltham used it is for any timepiece that was suitable for navigation. When these pieces were first made that was the English requirement although very soon the lever escapement came to be accepted in the hands of the best Swiss makers for any navigation purpose. One could argue that a timepiece was not a chronometer without a chronometer escapement. ![]() I am uncomfortable arguing with my good friend Andy, but I do not know of any "specifications" for chronometers at the time Waltham was making and selling them under that rubric. ERA Edwardian, 1901-1910 HALLMARKS American Waltham Watch Co Guaranteed, J. ![]()
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