Effectiveness of orchard heaters effectivenessofo0723kepn Year: 1951 50 55 Air temperature °F Heating in tree zone ^y 65 0 5 10 Heating effect, F 15 Fig. 13. Vertical profiles of temperature and heating effect in the center portion of a 15-acre heated area. Test was made during a night on which there was a large inversion. 300 250 i 200 C o en 4> J 150 o a I 100 50 35 Average of 5 traverses, 2:50-5:55 Fuel consumption, 33 gal. per acre per hour r

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