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 199
the sun. The trees and plantsof the tropics are quite different from those of the temperate regions, andthese again are unlike those of cold climates. In the far north and south, solittle heat is received that vegetation entirely ceases. Fig. 209. 476. The suns heat may be increased by collecting a… … A similar effect may be produced with concavemirrors, so arranged as to reflect the rays that strikethem to one and the same focus. When the Romanswere besieging Syracuse, 213 b. c, Archimedes issaid to have used a number of metallic mirrors withsuch effect as to set fire to their fleet. The…
Physics
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