The Chinese Recorder and Missionary Journal, Vol. 3: June, 1870, to May 1871 (Classic Reprint) - Hardcover

Doolittle, Justus

9780484290555: The Chinese Recorder and Missionary Journal, Vol. 3: June, 1870, to May 1871 (Classic Reprint)

Hardcover

ISBN 10: 048429055X ISBN 13: 9780484290555

Publisher: Forgotten Books, 2018

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Excerpt from The Chinese Recorder and Missionary Journal, Vol. 3: June, 1870, to May 1871

The Barometric readings are taken from a John Browning's Board of Trade Barometer, and reduced as nearly as possible to 32� Fahrenheit at the Sea level. The Thermome tors are registered instruments from Messrs. Negretti Gr Zambra, placed about thirty feet above the ground and fully exposed to the air, but protected from sun and rain. Readings are taken daily at 9 A. M. The degree of humidity (complete saturation being 100) is reduced from the difierence in the readings of the wet and dry bulb thermometers, and indi cates the amount of moisture in the air. The. Wind-gauge is known as Robinson's Anemom eter and consists of four cups which revolve with the wind, and, by means of clock-work, register the number of miles of wind that have passed. The Rain-gauge is of Howard's pattern, and placed about fifty feet above the ground, thus registering a much smaller quan tity than would be the case if placed near the surface. Experiments in England have shown that one at that elevation registers about half the quantity of one placed at two feet above the ground. Both these gauges are of Neg retti Zambra's make, and are read, like the thermometer, at 9 A. M. The height of the river is taken at time of low water, and shows the amount due to rains.

Fractions of a degree are considered in working out mean Temperature, Humidity &c., though, to save room, such fractions do not appear in the columns. T. B. C.

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