Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 86
ect the length of the pen-dulum rod, lengthening it when itbecomes warmer and shortening itwhen it becomes colder, it is nec-essary to have a simple method ofchanging the length of the pendu-lum, not only to secure a properperiod, but also to keep that pe-riod uniform throughout winterand summer.… … Fig. 23. 72 GRAVITATION [§130 130. Measuring g with Pendulums. — Having the equa-tion for the period of the pendulum in terms of its lengthand ^, in order to measure the force of gravity at any placeit is necessary only to measure the length and period of apendulum vibrating at that place. There is…
Physics
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