Re: Count wheel & backstop roller & Pendulum length to bob?
I have just had an (approximate) as they are running measure.toggle quoted messageShow quoted text
Clock No 1 - Lead bob about 16 lbs I believe - fitted with light early type weight tray. Approx 90 cm from top of lower brass suspension block to top of bob
Clock No 2 -Steel bob - 16 lbs nominal - fitted with heavier pattern weight tray and seconds trip. Again approx 90 cm from top of lower brass suspension block to top of bob
Both these clocks are running.
I can’t remember what the thread should be - but 8 BA is too small. Mine is 4BA (about 3.5mm outside diameter) and the threaded section is approx 65mm with about 12mm unthreaded and reduced diameter unthreaded at the bottom. These thread into the invar rod which has a female thread. The bob should be nominally about 16 lbs. On looking at a ’spare’ rod, there is no notch/mark.