on cloth made a ASPIRATORS FOR LABORATORY USE. fortune ; the roller skate cleared $1,000,000 before the at A, asindicated by the arrow. The air enters at B, BY GEO. M. HOPKINS. and both air and water are discharged at C. The craze died out; the gimlet ‘screw realized millions; Wherever a head of… … tube, but it is sufficient for the greater part of vacuum Fig. 5.—BLAST PRODUCED BY THE ASPIRATOR. CEIVER FOR ASPIRATOR: experiments. The aspirator can be arranged to produce air pumps in the matter of cost. They may Be had at threader netted $10,000 a year; toys and playthings a continuous blast…
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