Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 480
fixed there. With a battery of fifty cells, platinum maybe raised to a white heat at the focus of the flask. Again let a lens of glass or rock-salt (l, fig. 119),9 5 inches wide, and having a focal length of 3 inches, be Fig. 119. … placed in the path of the reflected parallel beam. The raysare converged; and at their point of convergence all theeffects of calorescence and combustion may be obtained, the 156 HEAT A MODE OF MOTION. LECI. XT. luminous rays being cut off by a cell m n, with planeglass sides and containing the…
Heat
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