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Show Bad Rick in Windows. Nearly every business contribute bits of specialized knowledge to tho common fund. It will strike many persons' as a curious piece of information informa-tion that plate-glass insurance com panles clas windows, with black lettering let-tering on them as "extra hazardous" risks. The explanation given Is that a black surface absorbs the sun's rays. P.y this means, it Is stated, an unequal expansion is produced throughout tho plate; and under the Influence of a sudden gust of cold or any other quick change of temperature a strain is developed de-veloped which may break the glass. |