Excerpt from The Monthly Bulletin of the State Commission of Horticulture, Vol. 3: January, 1914
In the mean time a careful comparison of the cost of oil protection with that of coal protection, including equipment, interest, deteriora tion, fuel. Consumed, and labor required... , gave oil the advantage. The equipment and store of fuel required about the same initial investment, but in handling a cold night it developed that seven cents' worth of fuel in the oil pot gave twice the efficiency obtained from nine cents' worth of coal. This was readily explained by the fact that even under superior conditions of combustion a pound of coal can not be made to give off more than about half as many heat units as the same amount of oil. A smaller labor cost was also an extra item in favor of oil.
With the factor of efficiency and cost so plainly and unmistakably in favor of oil, it is easy to understand why from the day when the sooted lemons first came from the washer clean and uninjured, we have firmly believed the oil pot to be the most effective, the simplest, cheapest, and therefore the most practical equipment for frost prevention.
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