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 . sity in ])roportion with the distance from city of San Francisco occupied a central ]Josition on the faultline and conse(iuently felt the maximum efiect. The main shock occurred at about ,5 A, INI. It wasaccompanied by a loud, crashing, rumbling noise, caused by thecreaking and cracking of timbers, the precipitation of chimneys,cornices, etc., the falling of loose and fragile
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 . sity in ])roportion with the distance from city of San Francisco occupied a central ]Josition on the faultline and conse(iuently felt the maximum efiect. The main shock occurred at about ,5 A, INI. It wasaccompanied by a loud, crashing, rumbling noise, caused by thecreaking and cracking of timbers, the precipitation of chimneys,cornices, etc., the falling of loose and fragile articles and humanvoices. There were subse([uent minor shocks at ., , , with a sharp shock at A. ]M. The duration of themain shock is given at from 28 to 40 seconds at different pointsalong the line of the fault. The accom])anying illustration is a record bj^ the seismo-graph of the Chabot Observatory at Oakland, Cal, by Prof Charles Burckhalter. This record is made by atracing point, which is independent of the earths movement, on a chart which moves with the surface. Theinstrument mao-nifies six times, so that the actual mo\ement of the earths sm-face would have been recorded. SEISMOGRAPIIIC RECORD of the earthquakeat the Chahot Observatory, Oakland, Cal., by Prof. CharlesBurckhalter. 14 within a rectanole about I x -?^. Tlic sudden and jarring motion of the earths surfaee can, however, be easilyimagined by the number and jwsition of the hues traced witliin tlie siiort time of 28 seconds. The earthciuake was sufficiently \iolent to awakeneverj^one who was asleep at the time. Iictures hangingon the walls were re\ersed; i)ianos, beds and otherarticles of furniture on casters moved away trom thewalls. Safes and top-heavy furniture were overthrown,and clocks, bric-a-brac, ornaments, dishes, books, etc.,were thrown from mantels and shehes. The effect of the earthciuake was to shake downabout per cent, of all the chimneys within the areaaffected. JNIan
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectear, booksubjectfires
