with boiling water. The 164] TRANSMISSION OF HEAT BY RADIATION. 195 hollow cone is fitted to the thermopile and lined with theblack paper, the instrument is placed near the heated surface,as at P. If the cone be produced to meet the surface it willcut it in the circle AB. Radiation from points… … Fig. 77. Move the thermopile back until it is in a position such asPl and observe the deflection; it will be found to be the sameas previously, and to remain unaltered whatever be thedistance to which the thermopile is withdrawn, provided onlythat the whole of the circle such as A^E^ lies on the…
Heat · Light
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