A natural philosophy : embracing the most recent discoveries in the various branches of physics, and exhibiting the application of scientific principles in everyday life .. (1899)
Quackenbos, G. P. (George Payn), 1826-1881 · New York, Cincinnati [etc.], American book company · leaf 58
113. The general effect of gravity isto draw bodies towards the earth; butsometimes it causes them to rise. Aballoon, for instance, mounts to theclouds. This is because it contains lessmatter than a mass of air of the samebulk, or, as we say briefly, it is lighterthan air. Hence the air, acted on… … A BALLOON. earths surface ? Two miles? A hundred miles? A thousand miles ? 110. Eepeatthe law of weight. 111. What is said of the weight of a body at different parts of theearths surface ? Give an example. 112. To what causes is this owing ? What wouldbe the result, if the earth revolved on its…
Physics
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