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CHAP. viii.]
Heat Value of Colours.
121
RESULT.
A.a. Painted white and exposed to the full rays
of the sun...... 100° F.
Painted French grey ditto ditto . 111°
Painted dark grey ditto ditto . 112°
A.b. Painted with one coating of grey over
white . . 108°
Painted with two ditto ditto . 116°
Painted white and exposed to the sun . 100°
Whitewashed ditto ditto . 98½°
B. Biscuit-box painted French grey . . 111°
Over this one coat of whitewash . . 102°
With two coatings ditto . . 96°
C. Biscuit-box painted lead colour . . 112°
Over this one coat of whitewash . . 103°
With two coats ditto . . 97°[1]
According to Dr. Parkes the material of clothes is of no importance as far as regards protection from extreme heat in the form of direct solar rays, and colour must be trusted to in this respect. White has the greatest protecting power, then grey, yellow, pink, blue, and lastly black. On the other hand, in the shade colour does not markedly protect against heat, and the thickness and non-conducting character of the material worn must be depended on.
- ↑ Lancet, May 9th, 1885.
