. Rudimentary treatise on agricultural engineering . has two steam cylinders,one within the other, united at the bottom, but with a clearspace of 1^- inches between them at the top under thecover, which is common to them both. The large cylinderhas an annular piston, both pistons are connected by onemain piston-rod (of the internal cylinder) 12 inches diameter,and four small rods (of the annular piston) 4|- inchesdiameter each, with a great cap or cross head, having acircular body 9 feet 6 inches in diameter, and formed toreceive the ends of the balance beams of the pumps. Thepumps are eleven
. Rudimentary treatise on agricultural engineering . has two steam cylinders,one within the other, united at the bottom, but with a clearspace of 1^- inches between them at the top under thecover, which is common to them both. The large cylinderhas an annular piston, both pistons are connected by onemain piston-rod (of the internal cylinder) 12 inches diameter,and four small rods (of the annular piston) 4|- inchesdiameter each, with a great cap or cross head, having acircular body 9 feet 6 inches in diameter, and formed toreceive the ends of the balance beams of the pumps. Thepumps are eleven in number, and each of them 63 inches indiameter, with a cast iron balance beam turning upon acentre in the wall of the engine-house, one end of which is LIBRARY uriivunsTY 14 MACHINERY AND IMPLEMENTS FOR DRAINAGE. connected with the great cap of the engine, the other to thepump rod. Each pump rod is of wrought iron, 3 inches indiameter, and 16 feet long, with an additional length of 14feet of patent chain cahle attached to the pump piston. Fig. The steam and pump pistons have a stroke of 10 feet inlength; each pump is calculated to deliver 6-02 tons ofwater per stroke, or 68-22 tons for the eleven pumps. Thequantity actually raised is found to be about 63 tons. Theaction of the engine is as follows:—The steam beingadmitted, the piston and great cap are thereby raised, andthe pump pistons make their down-stroke. At the top ofthe steam-stroke a pause of one or two seconds is made, to MACHINERY AND IMPLEMENTS FOR DRAINAGE. 15 enable the valves of the pump piston to fall out, so that, onthe down-stroke of the steam piston, they may take theirload of water without shock. In order to sustain the greatcap and its dead weight during this interval, an hydraulicapparatus is brought into use, which consists of verticalcylinders, into which water is admitted, forcing upwards twoplunger holes which sustain the cap, the water beingprevented from returning by spherical valves fitted at
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Keywords: ., bo, bookcentury1800, bookdecade1850, bookidrudimentarytreat03andr
