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Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)

Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 105

An illustration from Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .., 1899, leaf 105
triangular glass prism heldclose to the crevice turns this beam into a band of rainbow hues. If thehole can be changed into a small slit, say one fourth of an inch high and onefiftieth of an inch Avide, and if the light can further be made to pass in suc-cession through several prisms, instead of… … THE SPECTROSCOPE. solar spectrum. The image formed by the light of any luminous body,after it has passed through a prism, is said to be the spectrum of that body. VIII. THE SPECTROSCOPE AND ITS TRIUMPHS. The spectroscope consists essentially of three tubes joined in the form ofthe letter Y, one of…

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