. Bulletin. Science. A, is the Vane. B, is tlie Perpendicular Shaft C, is a Horizontal Circular Plate of light material attached to the shaft. E and F, two Rollers communicating motion to the Apron E F from left to right. 1, 2, 3, &c., are minute Cards, placed upon the Apron. G, is a Clock that regulates the motion of the Roller E, and consequently that of the apron and cards. D, is a small weight to relieve the Clock. N, NE, E, &c., are paper boxes placed upon the circular plate, to receive the cards, as they fall from the apron at E. fM Vi la tx ^^ C'|i|Hlil4;lllW^iiHlilllJ
. Bulletin. Science. A, is the Vane. B, is tlie Perpendicular Shaft C, is a Horizontal Circular Plate of light material attached to the shaft. E and F, two Rollers communicating motion to the Apron E F from left to right. 1, 2, 3, &c., are minute Cards, placed upon the Apron. G, is a Clock that regulates the motion of the Roller E, and consequently that of the apron and cards. D, is a small weight to relieve the Clock. N, NE, E, &c., are paper boxes placed upon the circular plate, to receive the cards, as they fall from the apron at E. fM Vi la tx ^^ C'|i|Hlil4;lllW^iiHlilllJ'illllillllllllM|^. iiiiar JiaiiiiaiiiiiiiiiiiiiiiiBiiiiiiiiiiiiiiiiiiHii lllilillilMIIIIHII IIIINIIIIIIIIIIIIIIiilllllllllllllllllllllllllilllllllllllilllllllllllllllllllilllllllllllllllllllllllllllllll^^ Figure 7.—In 1838 the pioneer American meteorologist James H. Coffin (1806-1873) devised a self-registering wind direction indicator; in 1849 '"'^ improved it as shovi'n here. The band, moved by clockwork, carries cards marked with the day and hour. In Coffin's earlier instrument, a part of which is now in the Smithsonian Institution, the vane carried a funnel for sand, which ran into a circular row of bottles. (From Proceedings of the American Association for the Advancement of Science, i8^g, vol. 2, p. 388.) barometer, thermometer and the psychrometer [mean- ing wet-bulb thermometer] every half hour . . and prints the results on a sheet of paper in figures," running a week unattended. The working of this register involved the insertion of a conductor in the tubes to make a circuit, the thermometers having open '' This was ten years after the de- 28 Report of the 13th Meeting of the British Association for the Advancement of Science, 1843, 1844, p. xi ff. I have found no other reference to this instrument. Considerable attention was given to the thermometer, however, for Wheatstone proposed to send it a
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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
