. American engineer and railroad journal . e on through the length of thenozzle. This passageway has a smooth cylindrical wall, and itslength provides opportunity to complete the mixing to a more orless perfect stage. It seems important that the mixing chambershould be a plain bore without turns or obstructions to effectintermingling; otherwise danger might perhaps arise in con-nection with the acetylene which is an explosive gas. In thistip, oxygen under high pressure drives acetylene under lowpressure along a straight and smooth bore. In that part of the torch back of the tip, the acetylene
. American engineer and railroad journal . e on through the length of thenozzle. This passageway has a smooth cylindrical wall, and itslength provides opportunity to complete the mixing to a more orless perfect stage. It seems important that the mixing chambershould be a plain bore without turns or obstructions to effectintermingling; otherwise danger might perhaps arise in con-nection with the acetylene which is an explosive gas. In thistip, oxygen under high pressure drives acetylene under lowpressure along a straight and smooth bore. In that part of the torch back of the tip, the acetylene is made 431 432 AMERICAN ENGINEER AND RAILROAD JOURNAL. November, 1910. to pass through a packing of asbestos and mineral wool. Thisprotection is similar to that afforded by the gauze of the min-ers lamp. The acetylene can pass, but not the flame. But, evenif a flare-back should pass this packing, there is another andvery reliable safeguard. The tube which leads back to the acety-lene generator-and-reservoir passes into and out of a water. BROKEN CYLINDER ON A VANCL-MN COMPOUND LOCOMOTIVE. AN AT-TEMPT WAS MADE TO REPAIR IT WITH THERMIT, BUT OWING TOTHE MOLD SLIPPING THE PIECE BROKEN OUT WAS NEW PIECE TO FIT WAS THEN CAST AND WELDED INTOPLACE BY THE ACETYLENE PROCESS AS IS SHOWN BE-, LOW. THE LOCOMOTIVE IS NOW IN SERVICE WITH NO SIGN OF A LEAK OR ANY WEAKNESS. tank. Here it is interrupted, so that communication b^weenthe two portions of the tube is only secured by passage throughthe water. A flare-back would thus be extinguished before itcould reach the acetylene supply. It would seem very unlikely,however, that a flare-back should occur, when the manner isrecalled of the way the two gases enter the tip. The oxygen comes in along the axis and forms the main cur-rent, because it comes in under higher pressure, and because itjdirection of flow is not changed in the tip. The acetylene joinsthis current coming in from the sides. It is under a less pres-sure and has its dire
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
