expands more than iron, so the same sort of thing happened. The one medium expanded and contracted more than the other, thus keeping the length constant.
Now, high quality wall clocks may enjoy the same sorts of compensation as their bigger brothers, the grandfathers, and indeed good quality French mantel clocks very frequently have mercury pendulums fitted to them.
These, then, are the four basic types of pendulum. I haven’t entered into the mathematics of pendulum calculation; there’s an excellent source for that which I’ll give later. My intention here has been solely to give you some idea of what the pendulum is and what function it plays in the clock.
I’m indebted to Wikipedia for some of the historical information in this article, and a lot of mathematical formulae may be found on their site.
A metal named Invar, and later Elinvar, came on the market and this has virtually no coefficient of expansion whatever.
http://www.theclockssite.com
Student Help File, Norwegian Wood Metronome 114 Bpm. Standard tuning along with melody.
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