Cut out one rectangle of each number with a sharp knife,
distributing them over the whole card. Then put a prominent figure
1 at the top of one side, 2 at the bottom and 3 and 4 on the other
side. The numbering and the cutouts are
[Illustration: The Key Card]
shown in Fig. 1. The two key cards are made alike.
The key card is used by placing it over a postal with the figure 1
at the top and writing in the spaces from left to right as usual,
Fig. 3, then put 2 at the top, Fig. 4, and proceed as before, then
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.
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