Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 480
s. The best mirror, however, scatters the rays more orless; and by such scattering, the beam at a great distancefrom the lamp becomes much enfeebled. The effect istherefore intensified when the beam is caused to passthrough a tube, polished within, which prevents the lateral LECT. XT. EXPERIMENTAL… … 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.
Heat
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