Hello all, I am building a mechanical device that functions like a stopwatch for a school project. I have several months to do this, and (please correct me if I'm wrong) I believe the device that does this in a watch is called a chronometer. My idea is to build a very barebones chronometer on a large scale because it will be stationary on a table; it doesn't have to fit on a wrist. The plan as of now is to hook up a big hairspring to a balance wheel and a swiss-lever escapement. I'll have a gear train connected that can do all the indicating. Precision must be down to tenth of a second and I won't be timing anything longer than a half-hour. Is this doable to any degree of accuracy? Thanks!!