Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 397
that the radiation fromthe light-sources we have named is very great. 374 STARGAZING : PAST AND PRESENT. Now let US insert in front of the lantern a piece ofdeep red glass, that is, glass which allows only the redconstituents of the white light to pass. Now if a ther-mo-electric pile. Fig. 164, be… … Fig. 164.—Thermopile and Galvanometer. it is sufficient to say (1) that the needle moves whenevera current of electricity flows through the coil of wiresurrounding the needles, and (2) that the pile consists ofa number of bars of antimony and bismuth joined atthe alternate ends, and whenever one…
Astronomy · Telescopes
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