. The Street railway journal . the end the most economical. The general fittingsand trimmings of the boiler are of the highest grade, the safety valvesand steam gauges being generally either of the Ashcroft or Ashtontype, unless otherwise specified. The water column used is eitherthe Reliance or Pittsburgh high and low water alarm. The blow-offvalves are specially made under patents owned by the Aultman &Taylor Macliinery Company, and are so designed that the disks arerenewable at any time, and both the disk and valve seat can becleaned without taking the valve apart. It will be noticed in the
. The Street railway journal . the end the most economical. The general fittingsand trimmings of the boiler are of the highest grade, the safety valvesand steam gauges being generally either of the Ashcroft or Ashtontype, unless otherwise specified. The water column used is eitherthe Reliance or Pittsburgh high and low water alarm. The blow-offvalves are specially made under patents owned by the Aultman &Taylor Macliinery Company, and are so designed that the disks arerenewable at any time, and both the disk and valve seat can becleaned without taking the valve apart. It will be noticed in theillustration, giving the rear view of the boiler, that these valves havetwo wheels, one directly above the other, the upper one beingsmaller than the lower. The larger wheel forces the disk down onits seat, the snialler wheel revolves the spindle carrying the revolving the larger wheel until the disk rests lightly on its seatand then revolving the smaller wheel, the disk is rotated on its Gas Motor Cars in FIG. 3.—SIDE VIEW OF BOILER. seat, effectually clearing it from any otjstructioiis that may haveaccumulated thereon. The side cleaning doors for the boiler are of a new designwhich permits the use of only one door instead of two, and whenthe door is opened it is thrown back entirely from the slot intowhich it fits, leaving a full and free opening for the introduction ofthe steam hose and when the door is closed, wedged shape. The firebrick tile, which line the door, are placed in a straight line in theopening, making a perfectly smooth wall on the inside and an abso-lutely tight joint against the leakage of air into the setting. Where very high pressures are to be used, say, in excess of 225lbs. to the square inch, the headers or manifolds for the reception ofthe tubes are made of the same material used in the cross boxes onthe drums. These boilers are built in sizes of from 125 h. p. up to 500 h. single units. The company also builds what is known as
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
