Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 303
uble con-vex lens, and then through a prism, a b c, built up ofplane glass sides, and filled with the liquid bisulphide ofcarbon. This liquid gives a richer display of colour thanglass does, and this is one reason for its employment inpreference to glass. The white beam is now reduced to 278 HEAT A… … Fig. 87. of a particular construction to pass gradually throughall these colours in succession, so as to test their heatingpowers, and you shall observe the consequent action onthe galvanometer. The experiment is made with a beautiful piece of ap-paratus (fig. 87), designed by Melloni, and…
Heat
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