. Electric railway journal . TIE TAMPING EQUIPMENT IN USE ON THEKANSAS CITY (MO.) RAILWAYS in ten hours, equivalent to one tie a minute. The av-erage days work with this same force was 500 tiesevery ten hours. The ballast used on this track workwas crushed limestone. A. E. Harvey, superintendentof way and structures, states that he had experimentedwith no other kind of ballast, but felt positive that theair tampers would work satisfactorily with any kind ofballast. Portable Battery Equipment forBond Tester The Roller-Smith Company, New York, N. Y., hasjust placed on the market a portable stora
. Electric railway journal . TIE TAMPING EQUIPMENT IN USE ON THEKANSAS CITY (MO.) RAILWAYS in ten hours, equivalent to one tie a minute. The av-erage days work with this same force was 500 tiesevery ten hours. The ballast used on this track workwas crushed limestone. A. E. Harvey, superintendentof way and structures, states that he had experimentedwith no other kind of ballast, but felt positive that theair tampers would work satisfactorily with any kind ofballast. Portable Battery Equipment forBond Tester The Roller-Smith Company, New York, N. Y., hasjust placed on the market a portable storage-batteryequipment for use with its bond tester. The containingcase, as shown in the illustration herewith, is 12 by 7 in. deep by 15 in. high and weighs approxi-mately 45 lb. This equipment comprises an Edison A-5 storage bat-tery of capacity, as the source of cur-. PORTABLE BOND TESTING STORAGE BATTERY rent; an ammeter, range 60-0-60 amp., to show the rateof battery charge or discharge; a rheostat the first stepof which is an open-circuit step, the succeeding stepsbeing used for establishing and bringing to correctvalue the rail current; and a knife-blade switch forinterruption of the circuit while moving the testerfrom joint to joint. A compartment for carrying thecables and clamps is also provided. 1168 ELECTRIC RAILWAY JOURNAL | Vol. XLVIII, No. 23 Impregnated Switchboard Stone Lin-Stun, which is a natural stone, impregnated withan insulating compound to render it entirely moisture-proof and increase the insulating resistance, is now be-ing manufactured by the Lin-Stun Company, 5010 Glos-ter Street, Pittsburgh, Pa. The maker states that testshave been made with 125,000 volts on pieces 1 in. thickwithout puncturing the stone. This material is espe-cially adapted for switchboards, panelboards, barriers,insulated walks and such other uses as req
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