Word: heating
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Dates: during 1920-1929
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...Ordnances and Nela Park. The General Electric Company offered him absolute freedom and unsurpassed facilities for pure research; he returned there for his last years to avoid the strain of administrative work. Research was his home. He was one of the world's leading authorities on radioactivity, spectrum analysis, heat radiation of stars and planets, and pressure of light...
...True the wind is the sole driving, force, but its direction and intensity vary from height to height. The: thing is to keep the craft at that altitude where the wind effects are most: favorable. Suppose a balloon im equilibrium at a certain height. The: sun may come out, heat the hydrogen, contained within the gas, cause it to rise too high. The unskilled pilot: may let out gas in too much of a hurry, drop rapidly, throw out too- much ballast to check his descent, shoot up and lose more gas. "Bobbing up and down," he soon exhausts both...
...making safety matches, and catches fire if you rub it hard enough with the powdered glass and active chemicals in the head of the match. This is a mild-mannered, quiet sort of a substance, it doesn't catch fire in the air until you heat it quite hot, it won't dissolve in anything, and it can be eaten without any discomfort...
Blow glass into a hollow sphere, kick it about like a football. Mould glass into a tumbler, heat it to the point where pieces of paper in the tumblers are charred, plunge it into cold water. These are tests which were withstood by recently discovered "unbreakable glass...
...Bureau of Standards, Washington, thorium oxide, most resistant to heat of all known substances, was melted (for the first time in history) by C. O. Fairchild and C. G. Peters. Platinum melts at a temperature of about 3,200 degrees Fahrenheit, but that does not begin to phase thorium oxide. Its melting point is probably over 6,000 degrees, which, of course, no thermometer can measure. It is used commercially in gas mantles. A gas flame does not affect it, but an electric arc may. The oxide does, however, shrink in volume at high temperatures. Thorium oxide has been utilized...