How? or, Spare hours made profitable for boys and girls (1887)
Holbrook, Kennedy · New York, Worthington co. · leaf 156
in Fig. 4. The opening a, b, CAMERA OBSCURA. 151 c, d, should in this case be sufficiently large to admit easy-play of the hand in sketching, and also allow an unob-structed view of the image. The mirror may be preparedwithout much difficulty. Get the glazier to cut for you apiece of looking-glass… … form of B, letting the ends com 3 at a and b, and placingyour mirror, face downward, upon the frame as in C; holdit in place by two bands of strong paper, passed aroundthe glass and wires, and pasted strongly on the back, atthe top and bottom of the mirror. When in use thisframe is placed over the…
Handicraft · Amusements
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