A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 169
to L is illuminatedby light from L. Place the lamps equidistant from the rod, and, shielding the eyesfrom the direct light of the flames, adjust the flames, turned edge-wise to the rod, until the shadows are of equal darkness. Then turn one of the lamps about in place until its flame is flat-wise… … FIG. 91. the lamps toward or from the rod until the shadows appear equallydark, and then record the distance of each flame from the corre-sponding shadow. Try each lamp in turn flatwise, the other being edgewise. Be-tween the trials test the flames again in their original position, tomake sure that…
Physics
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