I've realized two radiometric clocks 25 years ago, showing that a 25 watts lamp can move a 4 kg pendulum. Every features, mesures and facts can be found on my website: betrisey.ch under the ...
AN escapement in general is to be considered a good one just in proportion as it prevents variations of friction in the clock-train from reaching the pendulum.
NMAH copy 39088007807613 bound with: Instructions for erecting Riefler's astronomical clocks in air-tight glass cases / Clemens Riefler. [Munich? : C. Riefler, 189 ...
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