Engineering and Contracting . tside the vertical steel,the spacing varying from 6 to 12 ins. fromcenter to center. A Self-Contained Gasoline Rock Diill.(.Contributed.) The field of air and steam rock drilling hasbeen invaded by a drill using gasoline as theagency of motive force. It is an entirely self-contained drilling unit, consisting only of thedrill and tripod, and requires no other equip-ment. Mr. John V. Rice, Jr., of Philadelphia,is the inventor, and. it is the outcome of hismany years association with the rock drillmdustry. The drill has a full floating, free piston ac-tion. The pisto
Engineering and Contracting . tside the vertical steel,the spacing varying from 6 to 12 ins. fromcenter to center. A Self-Contained Gasoline Rock Diill.(.Contributed.) The field of air and steam rock drilling hasbeen invaded by a drill using gasoline as theagency of motive force. It is an entirely self-contained drilling unit, consisting only of thedrill and tripod, and requires no other equip-ment. Mr. John V. Rice, Jr., of Philadelphia,is the inventor, and. it is the outcome of hismany years association with the rock drillmdustry. The drill has a full floating, free piston ac-tion. The piston rod. pistons and bit are allconnected together, forming a direct strikingpiece, acting and striking the rock in thesame manner as the air and steam drills. Themotive force is furnished by two cylinders op-posed to each other. Fig. 1. .^ piston rod,fitted with a piston for each cylinder and onthe end of wliich is the bit chuck, continuesthrough the two cylinders. .-\ make and breakspark plug for each cylinder arc tripped and. »ir=-^T n S^
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
