Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 159
e nakedeye when you are looking at theSun and Stars. To make a pinhole telescope geta pasteboard tube about 1*4 inchesin diameter and 5 or 6 inches long.A paper tube for mailing papersand sheet music is just the thingand can be bought at any station-ery store. Cut out a disk, or circular piece of… … Fig. 149.—Disk op Card-board for Pinhole Tele-scope. WM//U///M/// 7Z2Z2 CARDBOARD TUBE ^ CARDBOARD TUBE \
Astronomy · Stars
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