. Central station heating. ll heat in enclosed porch. The two maps on page 147 show the average and mini-mum temperatures as recorded by the U. S. WeatherBureau. The average is taken for the usual heating sea-son from October i to May i. In estimating the amount of radiation required in abuilding, the minimum temperature should be noted, butan allowance made for the fact that the figures there givenare the extreme. For example, the minimum temperature for New YorkCity is 6° F. below zero, but, as a matter of fact, zerohas been very unusual in New York City for some time. The author u
. Central station heating. ll heat in enclosed porch. The two maps on page 147 show the average and mini-mum temperatures as recorded by the U. S. WeatherBureau. The average is taken for the usual heating sea-son from October i to May i. In estimating the amount of radiation required in abuilding, the minimum temperature should be noted, butan allowance made for the fact that the figures there givenare the extreme. For example, the minimum temperature for New YorkCity is 6° F. below zero, but, as a matter of fact, zerohas been very unusual in New York City for some time. The author usually deducts 10° from these figures andthen assumes the nearest number divisable by 5 as theminimum temperature. For example, Denver (— 29° less10° = — 19°) 20° below zero would be the extreme tofigure against. Chicago would be 15° below zero, Pitts-burg, 10° below zero. The average temperatures are given for reference, sothat the heating seasons in dififerent localities can becompared. BUILDING EQUIPMENT 147. Compiled from the United States Weather Bureau Reports Fig. 34—map OF THE UNITED STATES SHOWING IN EACH STATE THELOWEST TEMPERATURE RECORDED
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