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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 303

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 303
ceived onthe illuminated surface. This last condition is illustrated by the figure. The parallel linesPj^^ 4g representing a given number of rays of light, falling upon the oblique andvertical mirrors, M and N, will notilluminate them equally; for, all therays that fall on M will fall on N,… … OPTICS.Photometers. 297 528. Figure 49.—Photometers are instruments used to meas-ure the comparative intensity of different lights. There are severalkinds of these instruments, but none of them are as satisfactory formeasuring the intensity of lights as thermometers are for measuringthe comparative…

Physics · Astronomy

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