Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 50
hat thedistance shall be inversely propor-tional, as before ; that is BD:AC=AE:EB. • Fig-38- 139. A Couple. Two equal op- posite parallel forces have no resultant. Thus A C and B D are two equal andopposite parallel forces. Obviouslythe entire effect of such an arrange-ment is to produce… … Fis. 39. CHAPTER II.* UNDULATORY FORCES. 141. An oidulatory force produces vibrations in anelastic medium. These vibrations are transmitted to anindefinite distance, by a change of position, or of shape ofthe molecules of the medium. When the vibrations aretransferred from the medium to the human…
Physics
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