According to estimate, fully 7000 horsepower to tho acre, about 4.400.000 horsepower to the square mile, reaches the earth on a clear day in the form of radiant heat.
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Bibliographic details
Otago Daily Times, Issue 17942, 22 May 1920, Page 9
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29Page 9 Advertisements Column 4 Otago Daily Times, Issue 17942, 22 May 1920, Page 9
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