detritus, 20 for 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 puttingit into the cars, 4 laborers for un- of the excavator, and which, in case of resistance, per- was 30 revolutions per minute. By… … Fig. 3—GENERAL VIEW OF 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 least $96. an excavator comes into contact with a very hard…
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