Laboratory exercises in physics for secondary schools (1906)
Twiss, George Ransom, b. 1863 · Chicago, Scott, Foresman and company · leaf 207
make the card stand upright.Two square blocks, A and i?, have their diametersmarked or scratched on their upper surfaces, and areto be used as carriers for five equal pieces of candle.With chalk or pencil a perpendicular is drawn to thescreen at its middle point. On this perpendicular, LIGHT 185 at… … Fig. 39. —Rumforcls Photometer. equal small angles with the perpendicular and meet-ing the screen. On the perpendicular is placed asecond cardboard screen, so as to shield the two lightsone from the other. Operations. — (a) At the centre of the block Amount one of the candles, and along the…
Physics
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