English: Balance wheel in a cheap 1950s mechanical alarm clock, the Apollo, by Lux Mfg. Co. 2.4 cm diameter. Arrows point to the hairspring (1) and the regulator (2). It has a rate of 4 beats (ticks) or two cycles per second. The clock belongs to me and is still working.
This work has been released into the public domain by its author, I, Chris Burks (
Chetvorno). This applies worldwide. In some countries this may not be legally possible; if so: I, Chris Burks (
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Balance wheel and hairspring in a 1950s alarm clock