r 1667 a paper en- long. The current of air was furn- titled the "Double Pneu- ished by a 10 foot helix fan running at 300 revolutions per minute. He matioPump." Heexhaust- ed the air from a long then constructed at his own ex- metal tube, in which was pense an eight foot tunnel, which a traveling… … Medhurst, a London en- 10, which were made many years -TIME LOCK FOR VELOCIT? CURVES OF ago under his own direct super- gineer, who published PRESSURE AND 7.-DIAGRAM SHOWING TEAKSMITTEE. AIR IN TUBE. vision and need but little descrip- pamphlets in 1810 and 1813 tion. The letters and packages and…
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