nclosed in a cast-ironbob. The mercury, the bob and the- rod together weighforty pounds. The bob of the pendulum is a cast-iron jar,K, three inches in diameter inside, one-quarter inch thickat the sides, and five-sixteenths thick at the bottom, withthe cap, J, screwed into its upper end. The cap,… … Fig. 13. 68 THE MODERN CLOCK. for the lower end of the pendulum tube, H. The pin, J,holds all these parts together. The rod, L, extends nearly tothe bottom of the jar, and forms a medium for the trans-mission of the changes in temperature from the pendulumtube to the mercury. The screw in the cap,…
Clocks and watches
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
