. American engineer and railroad journal . Fig. 29. THE NEW THORNEYCROFT BOILER In consequence of the heating of the water contained in thethin tubes, it rises into the boiler and produces a rapid circu-lation.* The mixture of steam and water pouring out of theheating tubes into the steam drum strikes against a deflectorplate, by which the water is thrown down. The water ac-cumulating on the bottom of the steam drum, which is heremingled with the feed-water, flows down through the outsidecirculating pipes and through the water chambers to thewater tubes. • The Thorneycroft Company also build t
. American engineer and railroad journal . Fig. 29. THE NEW THORNEYCROFT BOILER In consequence of the heating of the water contained in thethin tubes, it rises into the boiler and produces a rapid circu-lation.* The mixture of steam and water pouring out of theheating tubes into the steam drum strikes against a deflectorplate, by which the water is thrown down. The water ac-cumulating on the bottom of the steam drum, which is heremingled with the feed-water, flows down through the outsidecirculating pipes and through the water chambers to thewater tubes. • The Thorneycroft Company also build their boiler in an-other form, which is especially adapted to the purposes ofcombined boilers. This form of boiler (figs. 29, 30) consistsof a large horizontal water drum and a steam drum lyingabove it, which are joined at the sides by several sets of. Fig. 30.; THE NEW THORNEYCROFT BOILER. weight and great economy in the consumption of coal, thathas brought this boiler to the front, so that it is especiallyadapted for places where the minimum weight and maximumsteam production must be obtained for a short time.(to be continued.) AN EXPERIMENTAL STUDY OF THE EFFECTOF THE COUNTERBALANCE IN LOCOMOTIVEDRIVE-WHEELS UPON THE PRESSURE BE-TWEEN WHEEL AND RAIL.* * See American Engineer and Railroad Journal, September, 1894,page 410. By \V. F. M. Gross. In the mechanism of a locomotive, the revolving parts atthe crank-pins, together with the reciprocating parts con-nected therewith, are balanced more or less completely by the • Paptr presented at the New York meeting (December, 1894),of of Jlecbanical Engineers. Vol. LXIX, No. i.] AND RAILROAD JOURNAL. 37 addition of masses, or counterweights, to the drivers. Hutsince the counterweights move in circular paths, it is only thehorizontal component of the radial foree deriv
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