he Scientific American : delivered at the valve 3. But this opening is only 1 inch area. in two batteries of four each. They are operated by a hy- We have therefore 1829 lbs. to the square inch. The piston, On page 140, (2), current volume of the Scientific Ameri- E, is 12 inches diameter.… … inches pitch, ought to give good results. lbs. pressure at the start, decreasing to 113-)-x30=3390 at the ^ ( » > » end. Then 206,677 — 3390=203,287-^2=101,643-1- lbs. average APPLICATION OV ELECTEIC LIGHT.—Fig. 2. A much-Needed Postal Convenience. pressure. But the plunger, F, which delivers this…
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