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 164
toward a window, look intothe smaller tube and move it back and forth in the other till the bestimage of the window or of objects outside is obtained. It is evident at once that the image is upside down; thatis, that the bottom of the image represents the top of theobject. This is due to the fact… … FIG. 88. For instance, the cone of rays A A from the tip of the arrowand the cone of rays BB from the other end, cross at mn,and appear in the image at the spots A and Br respectively. J42 PHYSICS. If the aperture mn were gradually made larger, the spotsA and B, illuminated from A and B…
Physics
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