ss each other at every conceivable angle,forming small air chambers, and the paper on each side seals up thedead air immeshed in the air chambers. This makes a material moreeffective than many layers of building paper for keeping a buildingwarm in winter and cool in summer. As a non-conductor of… … Keystone H.air Insulator. CROWN GYPSOM COMPANY, LIMITED 114 GYPSUM PLASTERS AND GYPSUM PRODUCTS i \- I M I ! I . PRODUCTS > INFORMA-TION. CROWN GYPSUM COMPANY, LIMITED LythmorE, Ontario, Canada. manufacturers ofGYPSUM PLAvSTERS AND GYPSUIM PRODUCTS TRADE
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