. The Street railway journal . nd hole is closed byan amalgamated metal disc which is locked in place by ahammer blow on a blunt chisel, making a burr in the angle-plate just above the top edge of the disc. To further insure LARGE STEEL VENTILATING FANS The Allis-Chalmers Company, for some years past, hasmade a specialty of large ventilating fans with diametersvarying from 12 ft. to 35 ft. These are of the double-intake,center-draft type. They are built up of sheet steel and an-gles, the blades being rigidly fastened to sheet-steel arms,which are in turn clamped between two cast-iron centers,
. The Street railway journal . nd hole is closed byan amalgamated metal disc which is locked in place by ahammer blow on a blunt chisel, making a burr in the angle-plate just above the top edge of the disc. To further insure LARGE STEEL VENTILATING FANS The Allis-Chalmers Company, for some years past, hasmade a specialty of large ventilating fans with diametersvarying from 12 ft. to 35 ft. These are of the double-intake,center-draft type. They are built up of sheet steel and an-gles, the blades being rigidly fastened to sheet-steel arms,which are in turn clamped between two cast-iron centers, soshaped as to present the least possible resistance to the airas it enters the fan; the blades are also well braced to insuretheir running true. The sides of these fans are enclosed,from the periphery of the intake to the periphery of the out-side or top blades, by steel plates reinforced by angle ringson the outside and by angles on the sides of the blades onthe inside. This construction insures a strong, rigid fan for heavy. NG FAN, DRIVEN BY DIRECT-CONNECTED ENGINE duty, and also prevents all loss of air due to clearance be-tween the fan and the side of housing, and also reduces thefriction for the same reason. The fan is usually mountedupon a hammered iron shaft secured to it by heavy large set collars in halves are placed one upon either October 13, 1906.] STREET RAILWAY JOURNAL. S83 side against the fan centers and clamped in recesses turnedinto the shaft; these prevent the fan from working upon theshaft. A bronze bushed water-jacketed bearing is placedupon either side of the fan, and these bearings, braced bysuitable columns, are supported on long sole plates, the endsof which rest on the foundation and are securely bolted to it. These fans may be arranged for direct connection to themotive power or provided with pulleys for belting, dependingupon the conditions of service, but in either case the ap-paratus is made exceptionally compact and combines maxi-mum e
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
