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 199
Fio. 119. FIQ. 120, Continue moving the eye in the general direction of 3, keeping it,however, about 30 cm. from the glass, until the image of pin No. 1is just hidden behind pin No. 2. Then place a pin at 3, in the samestraight line with the eye, pin No. 2, and the image of No. 1. Draw a fine…
Physics
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