. Better fruit. Fruit-culture. igii BETTER FRUIT Page 2^ Mr. Beals' efforts that the local ollice is now equipped with an almost com- plete set of meteorological instruments, and also receives the promptest atten- tion from the district station, especially during danger periods. The district forecasts were remarkably accurate considering the wide separation of the two stations. In all that has been published no figures have been given to show what a certain quantity of fuel will do under actual conditions. Of course, this can- not be accurately stated, but we can give what we might expect unde
. Better fruit. Fruit-culture. igii BETTER FRUIT Page 2^ Mr. Beals' efforts that the local ollice is now equipped with an almost com- plete set of meteorological instruments, and also receives the promptest atten- tion from the district station, especially during danger periods. The district forecasts were remarkably accurate considering the wide separation of the two stations. In all that has been published no figures have been given to show what a certain quantity of fuel will do under actual conditions. Of course, this can- not be accurately stated, but we can give what we might expect under set or ideal conditions. We will take as an instance the protection of a pear orchard with the trees set twenty-five feet apart on the square. With the trees in good bearing the maximum height at which fruit is borne is not more than fifteen feet, and is usually much below this. We will consider each pear tree as growing in a cubical space which, under normal atmos- pheric pressure at our elevation above sea level (1,400 feet) and at a tem- perature of thirty-two degrees Fahren- heit, contains, in round numbers, 600 pounds of air. If this space contained 600 pounds of water it would require 600 British Thermal heat units to raise the temperature through one degree Fahrenheit, but since the space is filled with air under the above conditions it will take only one-fourth as many heat units to raise the temperature one degree within such space. If one oil pot is provided for such a space, that is, one pot per tree, we will have seventy pots per acre. Each pot will have to take care of 600 pounds of air. Most of the crude oils used as fuels for orchard heating in this district aver- age nearly eight pounds per gallon, and it has been found by laboratory test that a pound (one pint) has a calorific, or heat value, of about 18,000 British Thermal units. Some oils test higher, some lower. In burning tests in the field under actual frost conditions it has been found that for the lard
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