ost active, con-taining salts of cobalt, for the -blackest parts, and passing itthen into acidulated water, an engraved plate is obtained.To reproduce leaves or plants, they are soaked in solutionsof metallic salts, and applied to the zinc, which is thentreated with weak acid. The author has… … STEAM TRAVELING CRANES AT THE VIENNAEXPOSITION. On page 95 of our current volume, we illustrated a largeand powerful traveling crane employed in moving ma- POSTAL TELEGRAPH CARRIAGE. crankshaft pinion gearing direct into the wheel on the drumshaft. The brake is arranged so as to be applied by a…
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