File:PSM V84 D425 Spherical porous cup atmometer.jpg
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| Description | Sectional diagram showing the essentials of the spherical porous cup atmometer with non-rain-absorbing device. A rubber stopper in the bottom bears besides the supply tube to the first mercury valve a larger tube for filling. The latter has a mask to serve as zero point and is covered by a loose fitting cap. Suction through the open tube at extreme left removes the air from the system and fills the whole with water. Mercury in the valves is shown as if evaporation were in progress; when rain occurs the column rises in the right-hand valva and falls in the other. | |||
| Date | ||||
| Source | D. T. MacDougal: The measurement of environic factors and their biologic effects. The Popular science monthly, Volume 84, p421. New York, Popular Science Pub. Co., May 1914. Online: archive.org. | |||
| Author | D. T. MacDougal | |||
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:56, 15 January 2014 | | 809 × 2,861 (139 KB) | Ineuw (talk | contribs) | Changed background to white |
| 23:35, 14 March 2011 |  | 809 × 2,861 (182 KB) | Martin H. (talk | contribs) |
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