2> 1 J^ THE ADVOCATE OF INDUSTRY, AND JOURNAL OF SCIENTIFIC, MECHANICAL, AND OTHER IMPROVEMENTS. NUMBER 31. NEW-YORK, APRIL 12,1856. VOLUME XI. of the bolts will simultaneously move, and IMPROVEMENT IN STEAM VALVES. carry their respective jaws. The jaws may, … F, rotates, fit together tight, and completely ed to about 212°. This preserves the upper notice. It is improved by the insertion of a This improvement may be used in connec- enclose the rack and spur wheels, so that dirt boiler from any sediment, all extraneous mat- tion with fixed or loose valves…
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