The Cambridge Scientific Instrument Co., LTD. · Cambridge University Press · leaf 52
rse placed at some distance from the furnace, while no part of them is raised above the air temperature by more than 80 Centigrade degrees. The radiation which emanates from a hot body, or which passes out through an observation hole in the wall of a furnace, falls upon a concave mirror and is thus… … Fig. 44. Fig. 43. Fe"ry Eadiation Pyrometer showing diaphragm for Fery Radiation Pyrometer Telescope. reducing aperture of telescope. The arrangement of the instruments is such that they are uninfluenced, within wide limits, by the size of the hot body or observation hole on the one hand, or on the…
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