The San Francisco earthquake and fire; a brief history of the disaster; a presentation of facts and resulting phenomena, with special reference to the efficiency of building materials, lessons of the disaster . sq. Johnson steel bars at l(i centres and No. 16. 3 mesh expanded metalimbedded in it. The flat ceiling of expanded metal lath and plaster has failed in numerous places. 115 ^ a Oj 3 ^ 0) oo ?(- ci r^ 4*M ffl o ri bC C /iS 3 tr ^ ?73 ,J5 3 >. ^ -Q ni -0 *^ 3 cs c o «4^ o u o ^ ^ a o ?v. 110

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