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Show OXYACETYLENE USED TO CUT GRANITE In repairing a ' dniAvbridgG across the Passaic river, al Newark, M. J.. it' became be-came necessary to remove a casting and pin from a gnmiie pier, according to the Compressed Air .Magazine. After several unsuccessful al tempi a to draw the pin, as narrated in Stone. the pin projecting pro-jecting down three inches into the ina-som-yj it was found necessary to cut a trench in the hard granite so that the casting mipht be .shifted laterally to one side for removal and replacement by a new and larger center casting. This trench was four feet long, nine incli.es wide and three inches deep, extending ex-tending under lite old casting. The culling cul-ling of the trench would have been an endless task had it not been discovetx-l that an oxyacetylene flame chipped the granite chute readily and could be used under the old easting without damaging the balance of the masonry. The desired channel was thus quickly obtained. The flame was also used tor cutting away the abutment back of the fixed span bottom chord to provide expansion ex-pansion clearance. |