. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. Fig. 1. Type of Screen Gate Used in Front opImportant Shafts serve to separate the shaft from the rest of the mineworkings and should always be closed in the event olfire in the shaft. Purpose of Fire Doors to Check the Draft Iron fire doors have been in use at many mines fora number of years, but the wooden door has provedequally satisfactory and much more economical. Thepurpose of all fire doors is primarily to check the draftand not to stop the progress of the fire. Should an 7
. Standardization of mining methods; a series of important articles reprinted from Engineering and mining journal. Fig. 1. Type of Screen Gate Used in Front opImportant Shafts serve to separate the shaft from the rest of the mineworkings and should always be closed in the event olfire in the shaft. Purpose of Fire Doors to Check the Draft Iron fire doors have been in use at many mines fora number of years, but the wooden door has provedequally satisfactory and much more economical. Thepurpose of all fire doors is primarily to check the draftand not to stop the progress of the fire. Should an 72 STANDARDIZATION OF MINING METHODS iron door be subjected to intense heat it would warpand the draft pass through unchecked, thereby exposingthe men to dangerous gases. Wooden doors should be. Shaft Door installed far enough from the shaft so that some timewill elapse before the fire reaches them. Fig. 2 is a drawing of a wooden door, which is com-paratively air-tight. It is made of double 1-in. boards FIRE PROTECTION OF METAL MINES 73 with roofing paper in between, and is designed to fitagainst a set of timber and not into a frame. Otherwiseany sag in the door or the frame or any swelling ofthe wood would prevent the door from closing is important that all doors should be hung in thisfashion and merely overlap the timbers a distance of
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Keywords: ., bookcentury1900, bookdecade1910, bookidstandardizat, bookyear1919
