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  1. M

    Ladd Watch Case Co.

    Thanks for posting this info. The Providence Directory of 1891 lists the Ladd Watch Case Co. at the address 104 Eddy St. J.A. Brown is President.
  2. M

    Ever heard of a clock with 2 Pendulums?????

    The four pendulum isochronal clock was at one time on loan from Hezekiah Conant to the Ladd Observatory. We've recently discovered glass plate photos in the University archives showing the clock installed at Ladd. Diagrams and a description of how it works can be found in US Patent 368814...

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Rockford's early high grade movements by Greg Frauenhoff