. The Street railway journal . it isonly necessary to connect the leads from the generators and bolt inplace the bus bars which run horizontally back of the switchboard. Motor Driven Radial Drill. The accompanying illustration is of a new half radial drill, de-signed to be driven by a direct connected motor. The motor is of theiron clad type, entirely covering the armature, pole pieces and field coils,with commutator and brushes extending outside of the motor housing. Itis free from external magnetism, which is necessary in order to keepsmall particles of steel and iron from adhering to the dr
. The Street railway journal . it isonly necessary to connect the leads from the generators and bolt inplace the bus bars which run horizontally back of the switchboard. Motor Driven Radial Drill. The accompanying illustration is of a new half radial drill, de-signed to be driven by a direct connected motor. The motor is of theiron clad type, entirely covering the armature, pole pieces and field coils,with commutator and brushes extending outside of the motor housing. Itis free from external magnetism, which is necessary in order to keepsmall particles of steel and iron from adhering to the drill. The armatureis mounted on a bronze spider which is attached to the cone pulley. Thecontrolling lever is arranged on top of the motor, and by a semi-cir-cular movement of the same all forward and backward speeds may beinstantly obtained, This, together with the back gears at the rear of theswinging arm, gives, not only a much wider range of speed than canbe obtained by a cone pulley, but a much more finely graduated MOTOR DRIVEN RADIAL DRILL. The column swings around an internal stump, and rests, at itslower flange, A, on balls to insure easy movement. The thrust on theelevating screw at C, and the drill spindle at B, is also taken up by ballbearings. The drill head is moved on the arm by a hand wheel, rackand spiral pinion, which is always within reach of the operator. Thespindle is spring balanced, and fed by a rack and pinion in connectionwith the quick return, which can be instantly released, a valuable feat-ure for tapping. The feed is obtained by pin gearing, and can bechanged while the drill is running. This tool is built by the Lodge &Davis Machine Tool Company, of Cincinnati, O. High Insurance Rate on a Car House. An extraordinarily high rate of insurance has been fixed by theNew York Tariff Insurance Association upon the new car house of theBrooklyn City Railroad Company, at Third Avenue and 58th structure is the largest of its kind in the count
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
