n and and was patented on Jan. 7, 1862; further information lic pumps, screw jacks, cranes, and other devices of the length of the lever were the only advantages, be- can be had by addressing the inventor, Box 406, a similar nature have been invented, and are in ex- tensive use. Herewith we… … we have given above. prevent the screw from We have omitted one binding or being bent. The very important subject, however—that of the hooped sides the screw, obtained in the machine. In this singlejack, Fig. 2, is similar in principle to the double one; the only difference is in the manner in…
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