Word: ib
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...stopped off on their way home from a Pan-American Press Conference at Valparaiso for a gigantic entertainment specially staged for them by the world's largest copper mines. They were to see one of the world's largest explosions, the firing of 3,000,000 Ib. of dynamite...
...engineers saw the images of the electrodes three inches apart, with the broad, vivid flow of the arc two inches wide. Then Dr. Suits produced an arc in an atmosphere of nitrogen. The arc band was pale, thin. But when he stepped up the nitrogen pressure to 1,200 Ib. per sq. in., the arc thickened and brightened until it was indistinguishable from that produced in hydrogen...
This thought occurred to Acting Superintendent A. B. Everts of the Cleveland National Forest in Southern California. But 50 gallons of water weigh 416 Ib. Hauling that much weight, plus a pump and its power unit, over a mountain trail is slow work. Gasoline pumps are convenient but heavy. Forester Everts hit upon a source of power that is light and cheap as well as convenient. He tried frozen carbon dioxide...
...does not melt to a liquid but sublimes directly from the solid state to vapor. When this takes place under confinement, the vapor is formed at high pressure.* Everts and two associates designed a power unit consisting of two small tanks containing 25 Ib. each of dry ice. Sublimed, this delivers a pressure of 1,000 Ib. per sq. in., which is stepped down by control valves to 250 Ib. before being applied to the water hose. Last week
Forester Everts successfully tested an experimental model, returned it to the shop to iron out minor kinks. Before next summer he expects to have several full-size units on duty in the woods. Dry ice costs only 4? per Ib. and one filling provides enough power to empty the water tank ten times...