. American engineer and railroad journal . cylinder through the small valve. When the vacuum isagain obtained, the atmospheric pressure forces the main valveback on its seat, thereby compressing the air in the dash pot,which, on account of the closure of the small valve, slowly es-capes between the piston and cylinder, allowing the main valveto seat itself without shock or jar. This valve offers little orno obstruction to the exhaust steam in case the engine is torun non condensing, and can be held wide open for this pur-pose by an attachment shown on the engraving. These valves are manufactur
. American engineer and railroad journal . cylinder through the small valve. When the vacuum isagain obtained, the atmospheric pressure forces the main valveback on its seat, thereby compressing the air in the dash pot,which, on account of the closure of the small valve, slowly es-capes between the piston and cylinder, allowing the main valveto seat itself without shock or jar. This valve offers little orno obstruction to the exhaust steam in case the engine is torun non condensing, and can be held wide open for this pur-pose by an attachment shown on the engraving. These valves are manufactured in various sizes to suit allrequirements, and are for sale by the Knowles Steam PumpWorks, 93 Liberty Street, New York. Vol. LXVIII, No. o.] AND RAILROAD JOURNAL. 427 MOSHER WATER-TUBE BOILER Ix the designing of a water-tube boiler for marine work itis necessary that it should be so arranged that it will occupythe least possible space and at the same time have its parts sorelated to each other that the expansion and contraction of the. FROST MEW OI Mu-HER- WATER-TUBE MARINE BOILER heated metals have the chance for a free movement. All ofthe generating parts should be of so small a diameter that incase any of them should be ruptured it will not necessarily in-volve a disaster. Circulation should be provided for sotbatnot only the water will pass freely from the cooler to the moreheated portions of the boiler, but that the steam should havean opportunity to liberate itself freely fromthe water. It is also very desirable that thepassage of gases in going from the fire to thestack should move as nearly as possible atright angles to the heating surfaces. The feedwater should not come in contact with theboiler plates, and ample facilities should beprovided for cleaning the tubes and otherparts. In addition to the above the boilershould show an economical efficiency in work-ing condition The boiler which we illustrate in this con-nection is one that has been designed by D: Mo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
