. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . our inches thick and firmlypacked to resist the action of the molten should be kept on until the mold is driedand a workable heat produced on theparts to be welded. The thermit charge should be thor-oughly mixed before being placed in thecrucible. The ignition powder should notbe added until the thermit charge is readyto be ignited. Tlie preheating openingshould then be carefully closed and packedhard to prevent the molten steel findinga way through this opening. Thermit willnot ignite from t
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . our inches thick and firmlypacked to resist the action of the molten should be kept on until the mold is driedand a workable heat produced on theparts to be welded. The thermit charge should be thor-oughly mixed before being placed in thecrucible. The ignition powder should notbe added until the thermit charge is readyto be ignited. Tlie preheating openingshould then be carefully closed and packedhard to prevent the molten steel findinga way through this opening. Thermit willnot ignite from the heat of the preheater. gate and the sections easily broken the construction of the crucible thereis a hard burned magnesia stone in thebottom, and the sides are magnesia tar-lined. This will last from 16 to 20 re-actions. In calculating the amount ofthermit to be used, a simple rule is to as-certain the amount of wax used in form-ing the mold, by weighing the wax beforeand after the operation, the difference be-ing the quantity of wax used and thisweight in pounds, multiplied by 25, will.
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