What to do and how to do it; the American boys handy book (1920)
Beard, Daniel Carter, 1850-1941 · New York, C. Scribner's sons · leaf 113
ontrivances. In Norway, the fishermen makepractical use of the water telescope when searching for herringshoals or cod, often by its means discovering new and un-looked-for fish. How to Make a Wooden Water-Telescope. All that is necessary is a long wooden box, a piece of glassfor one end, and some… … Fig. 60.—Wooden Water-Telescopes. A Tin Water-Telescope, IS a funnel-shaped tin horn, about three or four feet long, eightto ten inches in diameter at the bottom, and broad enough atthe top to admit both eyes of the observer (Fig. 61). Sinkersshould be soldered on near the bottom, as shown in the…
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