American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 182
through nine in threeseconds, and so on. A proof is therefore af-forded by this means that terrestrial gravityis a uniformly accelerating force. There are some familiar facts which seemto be opposed to this law. When we let go afeather, and a mass of lead, the one floats inthe air, and the other… … sistance offered. But if we place a mass oflead and a feather in the exhausted receiverof an air-pump, and liberate them at the sameinstant, they will fall in equal periods of time. Having ascertained the law according towhich gravity acts on bodies, the next ques-tion is to determine its absolute…
Clocks and watches
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