His first attempt, made in the same year, at the Dolcoath mine in Cornwall, failed in consequence of an accident to one of the pendulums; a second attempt in 1828 was defeated by a flooding of the mine, and many years elapsed before another opportunity presented itself. [Please select]
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Let them hang out their gigantic pendulums, and make the earth do the work of describing and measuring her own motions. [Please select]
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In a knife edge support, seen in some forms of pendulums, is exhibited a form of rolling friction. [Please select]
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CLOCKS AND WATCHES:--A short history of timepieces--The construction of timepieces--The driving power--The escapement--Compensating pendulums--The spring balance--The cylinder escapement--The lever escapement--Compensated balance-wheels--Keyless winding mechanism for watches--The hour hand train. [Please select]
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