. Railway mechanical engineer . Tool for Truing Grinding Wheels.—The diamond tool is the most efficient means for truing theface of grinding wheels for precision work so far reasons are: Diamonds or bortz are harder than thewheel to be trued; they are obtainable in sufficient quantitiesto meet the demand: they provide a means of making thewheel a true cylinder and at the same time provide anykind of wheel service desired; they lend themselves to areasonably easy setting and are conveniently applied to thework, and the waste of the wheel is negligible.—Grits andGrinds. TRIANGLE F
. Railway mechanical engineer . Tool for Truing Grinding Wheels.—The diamond tool is the most efficient means for truing theface of grinding wheels for precision work so far reasons are: Diamonds or bortz are harder than thewheel to be trued; they are obtainable in sufficient quantitiesto meet the demand: they provide a means of making thewheel a true cylinder and at the same time provide anykind of wheel service desired; they lend themselves to areasonably easy setting and are conveniently applied to thework, and the waste of the wheel is negligible.—Grits andGrinds. TRIANGLE FOR USE IN TRACING BY HUGH G. BOUTELL The accompaning sketch shows a triangle which was de-veloped by the writer and has proved particularly useful intracing work where speed is essential. It is made up of two45-deg. triangles, one enough larger than the other so thatit projects about J4 in- on all three sides. The two trianglesare held together with Le Pages glue. In tracing, considerable care is required to slide an ordi-. Convenient Triangle for Use in Tracing nary triangle up to a freshly inked line without touching thewet ink. In the double triangle, the j4-in. projection of theupper part obviates the danger of blotting the tracing. Italso allows greater lateral freedom of the ruling pen andmakes possible better matching up of straight lines andcurves. Railroad Coal Consumption.—The railroads of theUnited States used 128,200,000 net tons of coal in amounts to about 24 per cent of the total output. Thebituminous mines furnished 122,000,000 tons, which is 28per cent of their production, and the Pennsylvania hard coalregions supplied 6,200,000 tons, approximately 7 per centof the total production. Size of Steam Pipes for Reciprocating Engines.—Size of steam pipes for reciprocating engines operating atfull stroke may be determined by comparing the diameterof the cylinder squared and multiplied by the piston speedper minute with the diameter, assumed, for the s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
