. The Street railway journal . SAFETY TREAD FOR CAR STEPS against slipping, and has been in successful Operation on manyroads. Added to the immunity from slipping the safety treads takeall the wear, and as the lead, which constitutes the non-slippingsurface, is protected by a steel back and ribs, the treads will lastfor many years. Moisture, frost or light snow is said to have noeffect on their safety-securing properties. The safety tread can be used upon stairs, like those of the ele-vated stations in New York, Chicago and Boston, public buildings,railroad stations, school houses, etc., and u
. The Street railway journal . SAFETY TREAD FOR CAR STEPS against slipping, and has been in successful Operation on manyroads. Added to the immunity from slipping the safety treads takeall the wear, and as the lead, which constitutes the non-slippingsurface, is protected by a steel back and ribs, the treads will lastfor many years. Moisture, frost or light snow is said to have noeffect on their safety-securing properties. The safety tread can be used upon stairs, like those of the ele-vated stations in New York, Chicago and Boston, public buildings,railroad stations, school houses, etc., and upon ship ladders in thenavy, but during the past two years a large demand, which is con-stantly increasing, has been developed from the street railway com-panies. The American Mason Safety Tread Company, of Boston,manufactures these treads, and has agencies in all the larger cities ♦ ♦♦ - Vertical Air Pump and Condenser with CompoundSteam Cylinder. The condensing apparatus shown in the accompanying illustra-tion is designed for the engines of street railway plants and otherplaces where economy of fuel or increase of power is desired. Itis manufactured by the Dean Brothers Steam Pump , Ind., and combines several special advantages withthe general features of this companys output. The vertical type of air pump is said to be much more durablethan the horizontal type, because there is so little rside wear in thecylinder and stuffing boxes. In horizontal pumps especially large 513 VERTICAL AIR PUMP AND CONDENSER cross-head being of steel, and the rods fitted in on a taper andheld by Hat keys. The air-pump cylinder head may be taken entirely out of theway by unkeying the piston rod. The stuffing box and all valvesare water sealed, (here being no valves in the air piston. The dimensions of the apparatus shown are as follows: 14-in. ioo6 STREET RAILWAY JOURNAL. [Vol. XVI. No. 41. high-pressure steam cylinder, 20-in. lo
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
