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Fire-proofing Wood

Fire-proofing Wood image
Parent Issue
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OCR Text

Soak 27.5 parts by weightof sulpuate oí zinc, 11 of potash, 22 of alum, and 11 of raanganic oxide in lukewarm water in an iron boiler and gradually add 11 parts by weight of sulphuric acid. The wood to be prepared is placed upon an iron grating in an apIaratu8 of suitable tlze, the separate pieces being placed at least au inch apart The liquid is then poured into the apparatus and the wood allowed to remain three hours, and is then air dried. The mode of application described is, we fear, a serious obstado to the general use of this procesa for tüaber emplojd ín building, especially as the rough timber, before being worked or framed, could only be conveniently treated in this manner. If joists, ceiling beams and all kinds of joinery exposed to lire could be trested aftcr being fixed with some cliemical Bolution of proved resistance to the action of flame, we believe many arcliitecUi wou ld be found to employ ik -


Ann Arbor Courier
Old News