Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 39
36 PENDULUMS, Whatever number of balls may be let fall on oneside, the same number will have an equal motion onthe other, and the intermediate balls will remain motionless. … PENDULUMS. A pendulum, when put in motion, will descendthrough one half of an arc by its own gravity, and as-cend the other half by the velocity which it has ac-quired in its descent. Illustration, If a be a weight suspended by aline or wire, from the cen-tre or point of suspensionc ; when it is…
Physics
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-32-41.webp)
