. Documentary journal of Indiana 1905 . lover on them. In what manner this effect may haveresulted will be referred to later. INFLUENCE OF WOODS UPON THE RATE OF EVAPORATION TO, THE LEEWARD. At the time of the observations just described, others were madeto measure the rate of evaporation at different distances to the lee-ward of woods, using a form of Piche evaporometer rendered moresensitive by increasing the diameter of the evaporating surface inches, thus giving an effective area of sq. in., deductingthe area of the water reservoir, the latter being regulated to .1c. c. The ins
. Documentary journal of Indiana 1905 . lover on them. In what manner this effect may haveresulted will be referred to later. INFLUENCE OF WOODS UPON THE RATE OF EVAPORATION TO, THE LEEWARD. At the time of the observations just described, others were madeto measure the rate of evaporation at different distances to the lee-ward of woods, using a form of Piche evaporometer rendered moresensitive by increasing the diameter of the evaporating surface inches, thus giving an effective area of sq. in., deductingthe area of the water reservoir, the latter being regulated to .1c. c. The instrument as placed in the field is represented in Fig. 4. 230 Fifth Animal Report Fig. 4.—Showing the form of Piche evaporometer as placed inthe field. With a series of 6 of these instruments set up in a line at rightangles to the margin of a black oak grove having a mean heightof 12 to 15 feet, the rate of evaporation which occurred simulta-neously between 11:30 and 12:30 a. m. was measured, with the re-sults given in the next Fig. 4. Showing the form of Piche evaporometer, asplaced in the field. TABLE. Evaporation One Foot Above the Surface at Different Distances to the Leeward of a Grove of Black Oak in a Field of Sandy Soil Recently Planted to Corn. listance from Woods—Feet. Evaporation in One Hour—C. C. 20 40 60 80 100 120 These results show that until a distance greater than 100 feet isleached but little difference in the rate of evaporation was 120 feet the evaporation was 17 per cent, greater than at 20ieet. Three of the instruments were next set up at 20, 40 and 60feet, and at 280, 300, and 320 feet from the same grove and in thesame field. During one hour the amounts of evaporation were asgiven in the next table. State Board of Forestry. 231 TABLE. Evaporation at One Foot Above the Surface at 20, 40, 60, and at 280, 300, and 320 Feet to the Leeward of a Black Oak Grove in a Field of Sandy Soil Recently Planted to Cor
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