. The Locomotive. cusses the general subject of impact, and gives formulas for calculatingthe duration and force of a collision between a rigid body and an elastic barthat strikes against it endwise. In this first paper he touches only briefly uponthe application of the formulas to the case of water-hammer action in steampipes, but in the second one he dwells upon it at length, and gives a modifiedform of his fundamental impact formula, from which we can calculate thepressure that is produced in a steam pipe by a water-hammer. Mr. Stromeyers Experimental his second paper, Mr. Stro
. The Locomotive. cusses the general subject of impact, and gives formulas for calculatingthe duration and force of a collision between a rigid body and an elastic barthat strikes against it endwise. In this first paper he touches only briefly uponthe application of the formulas to the case of water-hammer action in steampipes, but in the second one he dwells upon it at length, and gives a modifiedform of his fundamental impact formula, from which we can calculate thepressure that is produced in a steam pipe by a water-hammer. Mr. Stromeyers Experimental his second paper, Mr. Stromeyer describes an ingenious form of ex-perimental apparatus which he constructed of glass for the purpose of studyingwater-hammer action in a horizontal pipe. This is shown in Fig. 1. The flaskF here corresponds to the boiler, and the bent tube TTT represents the steampipe, in which the water-hammer action is to be produced. On account ofthe rapid heating that the small quantity of water in TTT undergoes when the. Fig. 1.— Apparatus for Producing Water-Hammer Experimentally. apparatus is in action, it is surrounded by a water-jacket, as shown, and itis found that with this addition the action of the apparatus can be kept upas long as desired, whereas without the jacket it ceases as soon as the trappedwater has become as hot as the steam. The pinch-cocks, PP, represent drain-cocks on the pipe. A valve is provided, at b, consisting of a piece of rubbertubing, plugged at the top, and provided with a slit. Steam readily escapesthrough this, so long as the pressure in the flask is greater than that of theatmosphere; but when the conditions are reversed, and the pressure in theflask falls below that of the atmosphere, the slit closes and prevents theentrance of air. To operate the apparatus, the tube TTT is first filled with water to thelevel ]\L. The water in the flask is then made to boil violentlv, so that steam 204 THE LOCOMOTIVE. [July, escapes freely through the valve b. Whe
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
