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Hi, yep, we are on the same path. looks like a good way to measure up some springs, like me a whole bunch of springs but no idea what strength, has it been cut, shortened.
i will have to do some expirementing but got an idea how to make it. basically it rates the vibration to a ratio of the wanted vibration based on the springs strength if i have it right. take a known balance wheel that vibrates correct beat
take a reading on this guage, then look for springs with simular reading, should find springs with same reading for that wheel. the reverse of that is to take a balance and stick a spring on it, measure vibration, run the math to find a spring number on the guage to get the right vibration.
early on in this quest for clock and watches i read about hairspring in Otto Frei and they go by diameter, for a given spring then estimate whether balance is heavy or lighter and pick a spring strength one lower or higher. i saw this, said geeze i need a hairspring strentgh meter to check springs i will be all set, but couldnt come up with the math/ratio where this guage seems to come thru on both ends. I am handicapped so have plenty of time to keep mind busy.
getting the vibration frequency is simple matter of electronics or counting the old way. even a quick guess would bring the numbers close to get started. the finnish test would be bringing the watch to beat as we well know. cul brian f.