. The Street railway journal . ture. Otherpatented specialties bearing the same name are channel-irondraw-bars, Dedenda gongs, Dumpit sand-boxes, conduc-tors bells and others. The trucks are also of this make andare the well-known high-speed type 27-E-2 with solid forgedside frames, 6-ft. wheel base and 33-in. wheels. The general dimensions of the car are as follows: Lengthover the end panels, 38 ft. 8 ins., and over crown pieces, 48 ins.; width over sheathing, 8 ft. 4 ins.; from center to centerof posts, 2 ft. 8 ins.; thickness of corner posts, 2>Va ins- andof side posts, 354 nls- ! s
. The Street railway journal . ture. Otherpatented specialties bearing the same name are channel-irondraw-bars, Dedenda gongs, Dumpit sand-boxes, conduc-tors bells and others. The trucks are also of this make andare the well-known high-speed type 27-E-2 with solid forgedside frames, 6-ft. wheel base and 33-in. wheels. The general dimensions of the car are as follows: Lengthover the end panels, 38 ft. 8 ins., and over crown pieces, 48 ins.; width over sheathing, 8 ft. 4 ins.; from center to centerof posts, 2 ft. 8 ins.; thickness of corner posts, 2>Va ins- andof side posts, 354 nls- ! size of side sills, 4^4 ins- x 7^4 ins., andend sills, 5% ins. x 7% ins- The sill plates on the inside of theside sills, to which the bases of the posts are secured, are 13ins. x % in.; height of tread of lower step from railhead,16 ins.; from tread to tread of steps, 11 J/\ ins. ENCASED SPRING POP SAFETY VALVES The Crane Company, of Chicago, has brought out a numberof improved forms of pop safety valves for stationary, marine,. SEMI-CONVERTIBLE CAR TO BE EXHIBITED AT ST. LOUIS FAIR locomotive and portable boilers, also a variety of cylinder re-liefs, water reliefs, high pressure and hydraulic relief valvesfor all purposes and pressures. The construction of thesevalves embodies a self-adjusting feature which automaticallyregulates the pop of the valve. In other words, it maintainsthe least waste of steam between the opening and closingpoints, an improvement which will be readily appreciated, asthere is no necessity of readjusting to regulate the pop onchanges in the set pressure. In all pop safety valves it is necessary to have a pop orhuddling chamber into which the steam expands when the mainvalve opens, thereby creating an additional lifting force pro-portionate to this increased area and greater than the force ofthe spring, thus holding the valve open until the pressure is June 4, 1904.] STREET RAILWAY JOURNAL. 869 relieved. Means must also be provided to relieve this popcha
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
