


Lassen Sie jeder von uns schreibt, wie er für richtig hält- GB Werke ,Uhren oder VFU Uhren ,oder Junghans Uhren aber friedlich zusammen .
http://mb.nawcc.org/showthread.php?1036 ... escapement
John Hubby
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Default Re: 400 day clock / GB / cylinder escapement (By: Walesey)
Walesey, thanks for the compliments but I didn't write that GB article. I don't know who did but unfortunately there are quite a few inaccuracies regarding dates, types of clocks produced, who was involved when, etc so it would be best to use that only for a general reference. I'll contact the Chapter and offer to provide a corrected version.
For all, some general info:
•GB first cylinder was 1872, not 1875. There were made at least until late 1901 just before GB introduced their own Graham escapement clock.
•Harder worked first with Willmann from 1878 to early 1880 using his own crown wheel & verge design, no relation at all with GB.
•Harder contracted with GB in early 1880 to make 400-Day clocks using crown wheel & verge escapement, about 500-700 were made so production was much more than just prototypes, basically same as GB's cylinder in appearance.
•Schatz & Wintermantel developed Graham escapement March 1882, Harder patented UK in June 1882 and US in Dec. 1882. Clocks were virtually identical to GB version but had Graham escapement.
•Jehlin patent did lapse in 1887, however there were NO "copiers" of the Harder design because both the UK and US patents were still in force and JUF was dominating the German market.
•In 1895 Andreas Huber bought the Harder patents and started production by 1896 of an exact copy*, dominating exports and severely impacting JUF business.
•By 1900 the Harder patents expired and three companies entered the market in the next three years: GB in 1902, Ph. Hauck and W. W�rth in 1903. Kienzle and Claude Grivolas both entered in 1906; only Vosseler came later.
Here are corrected dates for the features listed in the Chapter article:
•Suspension Guard: 1905
•Pallet Inspection Holes: 1909 (in standard movements, these were in Plate 1193 wall models early 1904)
•First production of only commercial skeleton 400-Day: 1910
•Finial crest screws replaced by tabs: late 1910
•Beat adjusting Upper Bracket: early 1913 confirmed by March 1913 DRP patent
•4-Ball Pendulum: First version late 1915; Second Version 1926; Third Version 1928
•Lantern Pinions: 1926
There is no question GB were a major influence in all 400-Day production from the beginning in the 1870's and should receive due credit for their efforts.
The asterisk on the Huber copy* is to note there was ONE small difference, being that Huber used a click spring tab positioning hole in the back plate (see Plate 1471) which JUF did not at that time. JUF introduced their own version with a completely different click layout starting in late 1901 or early 1902. The JUF Patent Angemeldet plates had this new layout, think Plate 1471 (which is Huber) but with the click layout of Plate 1595.
Last edited by John Hubby; 07-07-2013 at 09:22 PM.