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Updated: May 4, 2025
Quenching the light by the ray-filter at F, and placing the pile at P, the totally reflected heat-beam is immediately felt by the pile, and declared by the galvanometric deflection. Invisible Images formed by Radiant Heat. Perhaps no experiment proves more conclusively the substantial identity of light and radiant heat, than the formation of invisible heat-images.
The starting apparatus consists of a small galvanometric helix, r, analogous to Thomson's siphon recorder, which is suspended from a cocoon fiber and capable of moving in an extremely powerful magnetic field, N S. This helix carries, as may be seen in Figs. 1, 3 and 4, a prolongation, v, at its lower end whose form is that of a prism, and which is arranged in front of the partition of the box, K, in such a way that it exactly covers the two slits, a and a when the bobbin is at rest, and in this case prevents the luminous rays of the lamp, g, from escaping from the box.
Five different trials were made at varying speeds of the driving shaft; the initial work on this shaft was measured by a dynamometer, and the available energy of the shaft of the receiving machine was ascertained by a Prony brake; the other results of the experiments were deduced from the constants of the machines and from galvanometric measurements.
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