considerable then secured by a padlock, and all access to the screws is advantages to the operator, since hecan thus place his work in whatever position is best suited to his convenience. A thus prevented When the maxim um pressure of steam at which the valve perspective view of the invention is… … shank is placed the flanged nut, G, into which valve is easily set to a pressure ranging passes the vise screw. The latter is held in from 10 lbs. to 100 Ibs., on the square inch. PENFIELD’S IMPROVED VISE. place in the movable jaw by a pin, H, ar- ranged in similar manner, to the pin, D, al-…
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