Vibrating hair spring. Hair spring is placed into a vibrating machine and operator selects the hair spring with an elastcity which would vibrate a balance wheel with period of 18,000 times per hour, 1936
Vibrating hair spring. Hair spring is placed into a vibrating machine and operator selects the hair spring with an elastcity which would vibrate a balance wheel with period of 18,000 times per hour, 1936
Size: 1669px × 1197px
Photo credit: © PF-(usna) / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: .., 1936, archives, depression, great, hine, historic, history, lancaster, lewis, lewishine, nara:arcid=518442, national, pennsylvania, thegreatdepression, usa, usnationalarchives
