. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . y wooden floor supports are betterthan iron ones because they will burn slowly and not warpor twist out of shape. Floors, walls and ceilings should befree from any oil finish, as this only helps fire to spreadrapidly and causes dry rot in wood that has not beenthoroughly seasoned—it is better to leave the pores of thewood open. The only way to prevent fire from spreading is to con-fine it where it originates. It is important to state fullyhow a room and
. The principles of mill and factory inspection for fire insurance purposes : with notes on the hydraulics of automatic sprinkler protection . y wooden floor supports are betterthan iron ones because they will burn slowly and not warpor twist out of shape. Floors, walls and ceilings should befree from any oil finish, as this only helps fire to spreadrapidly and causes dry rot in wood that has not beenthoroughly seasoned—it is better to leave the pores of thewood open. The only way to prevent fire from spreading is to con-fine it where it originates. It is important to state fullyhow a room and how a building communicates with otherrooms and other buildings. If buildings adjoin and com-municate freely with one another, or are built close together(compact construction), they are liable to be subject toone fire. Frame buildings so grouped, and by themselves,are always so. With brick buildings a plant may be dividedinto fire sections by heavy walls and by protecting allopenings in these walls (doorways, windows, holes for /tr,fu. iy//rooirs w ezs /IU3MI/rr£KS IYCR£ »P£/f Ontii^ccD or F/ft£.GKncMrr-(H -i^. DANGER OF UNPROTECTED WINDOWS A fire started at night in the lower building shown inthe picture, burned out the three upper stories of thisbuilding and destroyed a section of the roof; and alsospread to the two higher buildings through unprotectedwindows in the side wall of one and through windows ina light-shaft between it and the next one. The buildingin which the fire originated was of joisted constructionand extended from street to street (see plan on Page 35).The depth of the building and the location of the firemade the fire difficult to reach with hose streams fromthe street. 34 MILL AND FACTORY INSPECTION shafting, etc.), with doors or shutters made of seasonedwood double (or treble) battened and properly coveredwith lock-jointed tin after the manner of tinning a roof(for specifications see the standards of the National Boardof Fire Und
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