r taking up the screened springs, which were connected by chains with the frame more or less earthy nature of the gravel. Its velocity ballast and putting it into the oars, 4 laborers for un- of the excavator, and which, in case of resistance, per- was 30 revolutions per minute. By means of cams… … Fig. 3.-0ENERAL VIEW OF AN EXCAVATOR AND ELEVATOR AT WORK IN A BALLAST aUARRY. hammers alternately struck the sieve bars, and thus and 10 horses. This would have entailed a daily ex- breakages that inevitably occur when the bucket of prevented the sieve from getting choked up. Owing pense of at…
Patented · Patents · Munn · Academy · Scientific American · Short time · National academy · Horse power · Storage battery · Cubic feet · Express money · Hot air · Address munn · Electrical horse
Internet Archive · Public domain (published before 1931). Free to use for anything.
