Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 208
e ofpaper having a paraffine spot in the centre is equally lightedon both sides, the spot can no longer be seen. The formused is shown in Fig. 100. The lights are placed upon the DISTANCE AND INTENSITY OF LIGHT. 195 blocks G and E and the paper upon the block B. All theblocks slide upon the… … Fig. 100. tance from each light to the paper when the paper hasbeen placed so that the spot in its centre is no longer visi-ble, we have the distances required for the different lightsto give the same degree of intensity. EXPERIMENT. Apparatus.—Bunsen photometer, as in Fig. 100; 5 candles, 3 or…
Physics
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