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The Pamphlet Collection of Sir Robert Stout: Volume 66

Black-bulb and Radiation Thermometers

Black-bulb and Radiation Thermometers.

The difference in the amount of cloud in the atmosphere is best illustrated by a reference to the average readings of black-bulb and radiation thermometers, for which comparison certain observations from the stations on the opposite sea coasts of the Southern Alps have been tabulated; but the extreme readings of the black-bulb page 67 thermometer, especially at the southern stations, are very remarkable, as they frequently reach to 175° Fahr.

Christchurch, East Coast, 42° 38′ S.L. Hokitika, West Coast, 42° 42′ S.L.
Insolation. Radiation. Difference. Insolation. Radiation. Difference.
Summer 131.72 44.78 86.94 84.02 48.38 35.64
Autumn 111.92 37.94 73.98 73.04 41.72 31.32
Winter 91.22 28.04 63.18 61.70 33.44 28.26
Spring 124.52 34.34 90.18 75.02 39.56 35.46
Extremes 158.00 14.54 143.46 97.34 21.92 75.42