. Better fruit. Fruit-culture. BETTEH FRUIT Page 2S A test in such an orchard would roall> be worth while. As has been stated before, the fuels used are crude oil, 28-degree test dis- tillate, coal, wood (old rails and cord- wood), straw, sawdust and manure, the latter being mainly used to produce a dense smudge. One of the greatest difficulties in the use of crude oil and slop distillate is the presence of water, which tends to extinguish the flame or cause the pots to boil over. The presence of water in crude oil is due to the fact that water is forced into the rifled delivery pipes as a
. Better fruit. Fruit-culture. BETTEH FRUIT Page 2S A test in such an orchard would roall> be worth while. As has been stated before, the fuels used are crude oil, 28-degree test dis- tillate, coal, wood (old rails and cord- wood), straw, sawdust and manure, the latter being mainly used to produce a dense smudge. One of the greatest difficulties in the use of crude oil and slop distillate is the presence of water, which tends to extinguish the flame or cause the pots to boil over. The presence of water in crude oil is due to the fact that water is forced into the rifled delivery pipes as a jacket so that the oil will flow readily. Crude oil can- not be forced Hirough long lines of pipe without this water jacket. The water, though small in amount, goes directly into the storage tank, where, if the temperature of the oil rises, the water will sink to the bottom of the tank. It can then be drained ofT. Often, how- ever, the water, which at low tempera- tures is very nearly the specific gravity of the oil, remains in pockets, or small globules, distributed through the oil. Outside of the fact that the crude oil often contains water it has a very great tendency to deposit large amounts of soot on the trees, as well as tending to clog certain types of pots. Besides, a very large amount of residuum is left behind so that a second or a third filling will so coat the sides and bot- tom of the pot that it will hold much less oil in future fillings, and will, therefore, burn for a much shorter "period. For instance, a pot that will hold one gallon when clean will not hold more than three-fourths of a gal- lon after having been burned two or three times. This is a very serious defect, and one that cannot be over- looked. The crude oil from the wells of the Pacific Coast is unlike that of the East or Middle West in that it has an asphaltum base. No matter what the type of pot, a heavy asphal- tum oil cannot be perfectly burned; that is to say, combustion is not com- plet
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