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Piches Black & White Stock Photos
. The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army . ervice on evaporation and wind velocity.These experiments were made with the air at atemperature of 84° and a relative humidity of50^r, by whirling Piches Hygrometers at vary-ing velocities on an arm 28 feet in length. Theevaporation was found to be 2.2 times as greatwith a velocity of 5 miles as in a calm, 3.8 timesat 10 miles, 4.9 times at 15 miles, 5.7 times at 20miles, 6.1 times at 25 miles and 6.3 times at 30miles an hour. Thes Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-future-water-supply-of-san-francisco-a-report-to-the-honorable-the-secretary-of-the-interior-and-the-advisory-board-of-engineers-of-the-united-states-army-ervice-on-evaporation-and-wind-velocitythese-experiments-were-made-with-the-air-at-atemperature-of-84-and-a-relative-humidity-of50r-by-whirling-piches-hygrometers-at-vary-ing-velocities-on-an-arm-28-feet-in-length-theevaporation-was-found-to-be-22-times-as-greatwith-a-velocity-of-5-miles-as-in-a-calm-38-timesat-10-miles-49-times-at-15-miles-57-times-at-20miles-61-times-at-25-miles-and-63-times-at-30miles-an-hour-thes-image369625517.htmlRM2CD9W39–. The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army . ervice on evaporation and wind velocity.These experiments were made with the air at atemperature of 84° and a relative humidity of50^r, by whirling Piches Hygrometers at vary-ing velocities on an arm 28 feet in length. Theevaporation was found to be 2.2 times as greatwith a velocity of 5 miles as in a calm, 3.8 timesat 10 miles, 4.9 times at 15 miles, 5.7 times at 20miles, 6.1 times at 25 miles and 6.3 times at 30miles an hour. Thes
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