Lift Angle for old Bulova

[margolisd]

Hi folks. Long time no post. Having a baby means there is less time for watches

Does anyone know the lift angle for the Bulova 10A series of watches from the 1920s. I'm trying to get an accurate reading on a movement I'm repairing. In particular I have a 10AI. I couldn't find the lift angle anywhere so I tried to calculate it using this method. The result was 59 degrees. But that seems quite unusual...

 

[rogart63]

Should think you will be fine with using 52 degree . I have never seen a movement that has 59 degree lift angle . If you look at the other Bulovas they are around the same . 50 -53 . There would not be much different if you set it to 50 or 52 degree . 

[jdm]

Worth to note for the casual reader that since lift angle only affects amplitude calculation by a small amount, it is perfect possible to asses and regulate with a discording value.

[watchweasol]

Hi according to the lists Bulova 10 CK to 10CRAC are all at 50

[margolisd]

Thank, yes I spotted those on the lists. There seem to be a set of 10s that are very different. All from them 60s. Mine is from the 20s. It's similar to this:

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&2&2uswk&Bulova_10AE

Thanks for your advice. I think I'll just leave the machine on the default 52 and see how I go