> Suppose I have one of those beauties in my basement, with the requisite > apparatus to compare it to a Caesium clock disciplined by GPS. Suppose my > wife drives her 3000 pound car out of the garage, about 20 feet away. What > will be the affect of that local change in mass?
> Could I discipline a Shortt clock to GPS by using a PLL that slid a one ton > mass along the basement floor near the free pendulum? Sliding the one ton > mass is left as an exercise for the reader, as is installing it in the > basement. The one ton weight in the basement could be a lot closer than 20 feet. One ton is not a big deal if you have the resources for a basement setup good enough to get the best from a Shortt clock. Iron is 491 lbs/ft^3, so that's only 2x2x1 foot for a ton. The book Tuxedo Park describes Alfred Loomis' home lab. He had 3 Shortt clocks setup in a basement cave cut into bedrock. They would get into lock step unless they were arranged in a triangle all facing the middle. I don't know if the coupling was gravity or mechanical. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
