Hi: I stumbled across this patent while looking for drum chronometer patents. https://prc68.com/I/UkiahObs.shtml#Chrono It's for a pendulum clock assigned to Bendix Aviation dated March 14, 1950. It uses linkages instead of a hinge. It seems to be aimed at a more accurate mechanism. Looking for any information about it including where was it used? https://patents.google.com/patent/US2500433 https://patentimages.storage.googleapis.com/d2/c0/9f/2237e81bcb29cb/US2500433.pdf -- Have Fun, Brooke Clarke https://www.PRC68.com axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs.