Syncronising a pendulum clock to a quartz crystal
Many years ago my wife and I bought an old pendulum clock. It looks nice, but never kept very good time. After looking for a way to improve it, I was made aware of an article: A venerable clock is made highly accurate by equipping it with a quartz-crystal works in the 'Amateur Scientist' part of Scientific America, where the author syncronised a pendulum clock to a quartz crystal. (That may not be the exact title, but that is printed on the front page of the article.). I hope to do the same and build a syncronising mechanism for the above clock. The exact details of how this will be done have not been finalised, but will probably have an HP 10811A crystal, since I have a few of them spare.
A frequency standard is currently under construction.