. Electrical world. irect-currentmotors, ranging in power from I to 50 hp, are employed for driving 1the machine tools, cranes, etc. Many of the larger motors may beregulated in speed in the ratio of 2: i by means of field tools are driven in groups from short lengths of currents at 2,200 volts are transmitted by two inde-pendent overhead lines to the pump house (three miles distant) ,where two pumps, each capable of delivering 30,000 gallons per hour, ]against a total head of 165 ft., are driven by two 45-hp, three-phase Iinduction motors.—Lond. Elec, Febr
. Electrical world. irect-currentmotors, ranging in power from I to 50 hp, are employed for driving 1the machine tools, cranes, etc. Many of the larger motors may beregulated in speed in the ratio of 2: i by means of field tools are driven in groups from short lengths of currents at 2,200 volts are transmitted by two inde-pendent overhead lines to the pump house (three miles distant) ,where two pumps, each capable of delivering 30,000 gallons per hour, ]against a total head of 165 ft., are driven by two 45-hp, three-phase Iinduction motors.—Lond. Elec, February 19. Traction. Slot Point.—An illustrated description of the new slot point to |be used on the lines of the London County Council tramways. Inconduit tramways the divergence of the two slots at junctions hasalways been a source of trouble, due to the fact that the mergingof the slots one into the other creates an objectionable width of open- !ing. which, with 34-in. slots, sometimes amounts to 2 in. The nar-. FIG. I.—SLOT POINT. row rubber tires of light vehicles drop into this opening, causing avery unfavorable wrench when the wheel leaves the slot. The slottongues which are used to divert the plough are made in the form March 12, 1904. ELECTRICAL WORLD and ENGINEER. 531 of flat steel plates sliding backwards and forwards in resistances inthe side castings. These work at a distance of 1% in. from the topsurface of the slot rail. On these plates a number of projections arearranged so as to come within ^ in. of the road surface at the fixedslot point, thereby reducing the depth at the opening by il4 in. Thenose of the fixed slot point is tapered off to the level of the projec-tions, so that any wheel riding on the slot tongue is easily carriedon to the point. The projections are divided by radial slots, in orderto clear the strengthening ribs on the long cast-steel cover. In Fig. ithe lids of the slot points and the covers of the road boxes havebeen removed to show the
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
