Rumford, Benjamin, Graf von, 1753-1814, American Academy of Arts and Sciences · Boston · leaf 69
r confused; but by a care-ful examination the different parts of it may be distin-guished. The platforms on which the lights are placed arerepresented as being both fixed at the same horizontallevel; and all the six hollow knobs of wood are dis-tinctly seen, by which they are fastened to the… … of the Light emitted by Luininous Bodies. 47 is sitting before the photometer and looking at theshadows, are both represented in this figure. Care must always be taken, in making the experi-ments, to place the two lights and the centre of thefield of the photometer in the same plane. The frames of…
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