Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 39
ollows that a body of a large mass will be attracted strongly, andpossess great weight, while, on the contrary, a body made up of a smallquantity of matter, will be attracted in a less degree, and possess less weight.We recognize tliis difference of attraction by calling the one body heavy andthe… … VNHiat is a Sys-tem ofWeiiihtsand Measures? lead is drawn to the earth with a force exactly equal to the superiority of its mass over that of the feather. If,however, we tie on a suflficientnumber of feathers to make up aquantity of matter equal to thatof the lead, the equilibrium is re-stored—the…
Physics · Science · Technology
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-249-25.webp)
