. Engineering and Contracting . It operates onthe principle of thrusting a stick into clay, and there is,therefore, no spoil. The whole apparatus is portable. The machine consists of an hydraulic cylinder of steeltube, carried on trunnions in a light steel frame. The trun-nions are near the closed or rearward end, and on them thebarrel can be turned from a horizontal to an upright posi-tion. Inside the cylinder is a short piston with hinged guid-ing fingers. The barrel is capable of slight adjustment fromthe true horizontal by suitable training and elevating gearof a simple order. This gun com
. Engineering and Contracting . It operates onthe principle of thrusting a stick into clay, and there is,therefore, no spoil. The whole apparatus is portable. The machine consists of an hydraulic cylinder of steeltube, carried on trunnions in a light steel frame. The trun-nions are near the closed or rearward end, and on them thebarrel can be turned from a horizontal to an upright posi-tion. Inside the cylinder is a short piston with hinged guid-ing fingers. The barrel is capable of slight adjustment fromthe true horizontal by suitable training and elevating gearof a simple order. This gun complete on its frameworkis dropped into a pit dug in the ground to the depth required,a plate at the back of the framework or carriage pressingagainst a few timbers to distribute the load. The cylinderis connected by flexible pressure pipes to a little three-throwpump driven by a petrol engine. The exhaust water returnsto the sump from which the pump draws. The operation of (21) 746 Engineering and Contracting for June 30,
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