On 2020 Apr 03, at 22:08 , Eric Scace <read@...> wrote: Neil — I would suggest attaching the bob to the glass with modern epoxy or even Gorilla Glue. Not only do you avoid the complexities of dr

Hi Graham — The problem appears to be that the solenoid does not raise the gravity arm high enough to latch reliably under this configuration. Try adjusting the solenoid’s armateur to raise the gravit

The roller is intended to roll off the pallet. That brings the full weight of the gravity arm into the contact closure, in order to have a more reliable contact closure.

Depending on how the frame has been attached to the case, and the case attached to the wall, the location of the yoke can be significantly different than apparent centerline. There is not an easy way

Vacuum tubes/valves vs pendulum tanks: Typical internal pressure is 10^-6 mb. To reach that pressure requires a multi-stage process: a) evacuation with mechanical pump while b) heating the glass envel

At the moment I cannot lay my hands on the reference for the following statements — my apologies. Clocks with pendulums in vacuum vessels fall into two categories: clockwork contained in the tank with