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 210
such small spots each in its own place. For thepurposes of this Exercise the distant object need not be more than 150or 200 feet from the experimenter. The images on the screen willbe much more distinct if the apparatus is used in the back part ofthe room, well away from the windows. REFRACTION OP… … FIG. 135. SECOND METHOD.—Remove the screen from its block and put thepin upright in its place. Let the pin, thus mounted, be placed onthe meter-rod, about as far from the end of the rod as the pupilusually holds a book from his eyes when reading. Place the lenssomewhat farther from the same end of…
Physics
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