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Cork insulation; a complete illustrated textbook on cork insulation ...

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HEAT CONDUCTIVITY 117<br />

method, but the inaccuracies are reduced, by comparis<strong>on</strong>, to<br />

the loss of heat through the box supports, and are corre-<br />

sp<strong>on</strong>dingl}^ more reliable. This method of testing has c<strong>on</strong>-<br />

FIG. 40.—THE OIL-BOX METHOD OF TESTING HEAT TRANSMISSION.<br />

siderable merit, and can be used with fairly good results as<br />

a method of testing any <strong>on</strong>e material al<strong>on</strong>e.<br />

77.<br />

—<br />

The Cold-air-box Method.—The cold-air-box method<br />

t T<br />

.„<br />

1\. rzj<br />

FIG. 41.—THE HOT-AIR-BOX METHOD OF TESTING HEAT TRANSMISSION.<br />

of testing c<strong>on</strong>sists in the substituting for the heater and the<br />

fan in the hot-air-box method, a c<strong>on</strong>tainer of cracked ice sus-<br />

pended inside the cubical test box near the top. The air in<br />

I

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