Show Process for Rendering Lumber Fireproof Found A new process for fireproofing lumber lum humn ber discovered b by II If A. A Dorr a tire tire- proofing expert has IMS been announced Maple fir Jr yellow el low and white pine and oak ouk lumber r treated by the new ne process s been tinted tested by hy the Co Co- university testing and hate been hen found acceptable for use tue In 10 the Interior construction of fireproofed hy by b the bureau of S of New ew York city cHy whose regulations are regarded us as the most stringent In the country The Tile new process prore Involves 19 the Impregnation Im of bf t lum lumber lr 1 with Ith a nonpoisonous lion non poisonous chemical solution after It Is kiln dried for tor n a period not ot exceeding 4 43 hours according to the type trpe of wood Apparatus has hns already keen been D constructed which treats lumber up Ip to N feet In length and l I i Inches In thickness The 1111 treated wood wand re re- retains Its natural color nail cnn can be worked forked ns us easily as lain wood without with out Injury to machines or tools It t accepts paint varnish shellac or r othel oth oth- el and does clues riot not warp wurp or rot The process heat Im's lI also been hlen tried out successfully 1 with a R number of at the better bet ter knoll ler-knoll n tabulation materials |