On the differential evaporation recorder
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概要
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The amount of evaporation in a large size evaporation pan is measured by reading the level of the water surface with a hook gage. In the sun, however, the water surface level varies with the change of water temperature. Then, the diurnal change of evaporation can not be measured by the leveling method with the hook gage.The authors have designed and constructed the differential evaporation recorder with which the change in level owing to temperature variation is cancelled and that owing only to evaporation is recorded. The instrument consists of three parts: two floats, a differential mechanism with a pair of pulley and a string, and a tappering recorder. As shown in Fig. 1, one float (F1) moves vertically in response to the changes in level of the water owing to both of evaporation and expansion, and the other (F2) floating on the oil covered surface in the small cylinder (C) responds to the changes in level owing to the expansion and contraction of the water. The motion of two floats is each converted into the motion of the pulleys (P1, P2) by the levers, and the difference of two vertical motions of the pulleys is transmitted to the terminal of the pen-arm by the string (f).The pen is kept a little apart from a recording drum and pushed against the drum once a minute by tapper-bar driven by a synchronous motor.This instrument can record the amount of evaporation in the precision of 0.1mm. Photo. 1 shows a example of the records, from which calculated intensity of evaporation is illustrated in Fig. 3 with the diurnal variation of other weather factors.
- 日本農業気象学会の論文
日本農業気象学会 | 論文
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