The Boy Mechanic: Volume 1 - 700 Things for Boys to Do by Popular Mechanics Co.
page 79 of 996 (07%)
page 79 of 996 (07%)
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3 as in Fig. 5, and 4 as in Fig. 6. The result will be a jumble of
words as shown in Fig. 2, which cannot be read to make any sense except by use of a key card. --Contributed by W.J. Morey, Chicago. ** Homemade Carpenter's Vise [36] The sketch shows an easily made, quick-working wood vise that has proved very satisfactory. The usual screw is replaced by an open bar held on one end by a wedge-shaped block, [Illustration: Vise Made Entirely of Wood] and the excess taken up on the other end by an eccentric lever. The wedge is worked by a string passing through the top of the bench and should be weighted on the other end to facilitate the automatic downward movement. The capacity of the vise, of course, depends on the size and shape of the wedge-shaped block. --Contributed by J.H. Cruger, Cape May City, N.J. ** Toning Blue on Bromide and Platinum [36] After some experimenting to secure a blue tone on bromide prints, a correspondent of the Photographic Times produced a very pleasing |
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