... nearly filled with mercury (quicksilver). m is a permanent steel magnet, fixed to the bottom ofthe stirrup. bb are reels ofa#39; insulated ... The break ce and the electric agt;circuit is the same as explained in the former diagrams; the arrows indicate theanbsp;...
|Title||:||A Short History of the Electric Clocks, with explanations of their principles and mechanism, and instructions for their management and regulation|