Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 309
l metal spirit-lamp with a cylindrical bowl 7 cm. indiameter and 4 cm. high. The wick-holderis a German-silver tube 8 mm. in interiordiameter, 0.15 mm. thick, and 25 mm. high.The wick is carefully made to just fit thetube, and the height of the flame is adjustedto be 4 cm. The liquid burned is… … STANDARDS OF LIGHT 299 QUESTIONS AND PROBLEMS 1. Distinguish between illn,minati7ig ^wwer and intensitij of illnmiiMtion. 2. When using a Rumford photometer (Fig. 326) the distance -L^t wasfound to be 20 inches and L._,b was 50 inches. Compare the illuminatingpowers of L^ and Lg- 3. Two equal…
Physics
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