Expert: William J Perkins - 8/24/2009

Question
I included the numbers in correct order in my orginal question reguarding lost pend.: but you did not help me. Here they are again: 376987   77 5 76. Please answer.
Jack

Answer
I have scanned the resources of my library and have been unable to find an explanation of the numbers you provided, both times.  I was hoping there was an error of some sort in the first submission which served as the basis for my initial research.  Although I have no basis for this conclusion, other than instinct, I presume your clock to be one of the J-77 series using small 5" X 5" plates, in which case the pendulum length would most likely be 77cm.  It could also be one of the J-93 series using 6" X 9" plates, that being the case the movement would require a 94cm pend.  Regardless of the forgoing I think your best bet is to make up a test pendulum of 116cm length.  (This being the maximum length used by Jauch) start the clock running with that length and gradually reduce its length in the following increments 114cm, 94cm, 93cm, 78cm, 77cm, 75cm, 68cm and finaly 64cm.  Somewhere within that group you will hit upon the right formula.  With that done seek out a suitable final, pendulum for the clock.  You can acquire pendulum and parts from Ronell Clocks, Merritt's Antiques, TimeSavers, or Empire Clocks.  All of these firms sell to the public and well as to the trade.  They all have a presence on the inter-net with online catalogs.  I wish you the best of luck.  Regards WJP