Technical paper . A. VIEW SHOWING EFFECT OF STRONG EXPLOSION ON ROCK-DUST-PROTECTED B. ROCK-DUST-PROTECTED VENTILATING DOOR, END BOARD OF UPPER COMPARTMENT HASBEEN REMOVED TO SHOW CHAINS. ROCK-DUST BARRIERS. 37 frame. The door is hung by the usual type of hinges, 2, to thedoor frame in such a way as to be self-closing. The short planks,7, are set in place on the inside of the posts at the ends of the sidecompartments; these also are not nailed but are held in positionby the dust loading. Crossbars, 10, are then placed on cleats, 9, attached to the posts, crossbar on the door s
Technical paper . A. VIEW SHOWING EFFECT OF STRONG EXPLOSION ON ROCK-DUST-PROTECTED B. ROCK-DUST-PROTECTED VENTILATING DOOR, END BOARD OF UPPER COMPARTMENT HASBEEN REMOVED TO SHOW CHAINS. ROCK-DUST BARRIERS. 37 frame. The door is hung by the usual type of hinges, 2, to thedoor frame in such a way as to be self-closing. The short planks,7, are set in place on the inside of the posts at the ends of the sidecompartments; these also are not nailed but are held in positionby the dust loading. Crossbars, 10, are then placed on cleats, 9, attached to the posts, crossbar on the door side of the frame is preferably placed some-what higher than the other crossbar, 10, as the free end of a self-closing door needs additional height when open. Short planks, 12,are placed from the crossbar 3 of the door frame to the crossbars planks, 13, are placed from rib to rib to inclose the ends of theupper compartments. In testing this arrangement in explosions, as with the concentratedbarrier and box barrier, it was found desirable to fasten the floorplanks of the upper dust co
Size: 1772px × 1410px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
