Our boys; what they can do and how to do it (1893)
Stoddart, William, [from old catalog] comp · New York, Hunt & Eaton; Cincinnati, Cranston & Curts · leaf 79
y mechanical problems that might present themselves.Luckily it was vacation, and they could command the neces-sary time. In the first place they fitted a board a foot wide across thebottom of the window, and in the middle they bored a one-inch hole, blackening its interior to prevent the reflection… … side of the hole they secured a spectacle glass, taken from apair of grandmothers the nosebridge of which had beenbroken. Tom explained to Joe that this was the lens, whilethe hole in the board was the lens tube, and the piece of leadthe diaphragm or stop of which they had read in the much-perused…
Handicraft · Amusements · Sports
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