Word: pinhead
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Explosives. Extremely dangerous are the dynamite-caps or detonators used for blasting in mines. Last year a Baltimore woman, opening the door of a furnace, was struck in the breast by a copper pellet no bigger than a pinhead, which killed her. Investigation showed that the pellet had come from a detonator, no doubt left in the coal by a miner; that such detonators not only hurl a pellet at 6,000 ft. per sec. (three times the speed of a rifle bullet) but throw hundreds of minute shreds of copper, each able to penetrate nearly a millimetre of brass...
...resultant pressure would be some 1,440,000 lb. per sq. in. Such a pressure, Harvard University announced last week, has been produced in its physics laboratories by stocky, soft-spoken Percy Williams Bridgman and maintained for 15 hours on a speck of graphite as big as a pinhead...
TIME'S comparison (Oct. 21, p. 56) of a ripe human ovum with a pinhead gives an inadequate concept of the true size of this interesting cell. Actually its diameter is but 1/200 in. This is about the size of the smallest grain of sand that could be seen with the unaided eye. Stated differently, a sphere having the diameter of a common pinhead (1/12 in.) possesses nearly 4,000 times the volume of a human egg. One can compute further that all the eggs needed to replace the present population of the world could be held...
...release of atomic energy, that is, consumption of matter as the raw material of radiation? Sir Arthur Eddington believes an internal temperature of 20,000,000° C. is enough. Sir James Jeans thinks it must be 40,000,000° or 50,000,000°, adding that a pinhead heated to this point would radiate energy at the rate of three quadrillion horsepower, knock down fortresses by sheer pressure of radiation (TIME, Nov. 19). Last week a Harvard physicist named T. E. Sterne offered the electrochemists calculations boosting the inside temperatures of ordinary stars (the sun is an ordinary...
...original Lord's Prayer on a pinhead, pride of the Chicago Fair of 1893. Engraved by one A. Schiller who took 25 years to do the task and went blind at its end, the pinhead contains 254 letters...