. Electric railway review . <U Cut No. 1 shows a cross section of a Keystone Giant Strain Insulator. The strain shell is of one piece, malleable iron, of extra quality. The very black lines indicate solid mica washers and the light parts malleable iron. <H Cut No. 2 shows the unassembled Insulator, A being the malleable one-piece shell,B the insulated bolts, C the solid mica discs between the two insulated bolts, D the mica washers, and E the strain ring over which the shell is folded. *K For mechanical strength and perfect insulation, Keystone Giant Strain Insulators are unsurpassed. Th
. Electric railway review . <U Cut No. 1 shows a cross section of a Keystone Giant Strain Insulator. The strain shell is of one piece, malleable iron, of extra quality. The very black lines indicate solid mica washers and the light parts malleable iron. <H Cut No. 2 shows the unassembled Insulator, A being the malleable one-piece shell,B the insulated bolts, C the solid mica discs between the two insulated bolts, D the mica washers, and E the strain ring over which the shell is folded. *K For mechanical strength and perfect insulation, Keystone Giant Strain Insulators are unsurpassed. Their approximate breaking strength varies from 3,500 to 10,000 pounds, according to size. Electric Service Supplies Co. Railway Material & Electrical Supplies MiSYER &ENGLUND NEW YORK GABTON-DANIELS DEPT. KEOKUK PITTSBURG SAINT LOUIS PORTER &BERG DEPT CHICAGOATLANTA For Public Utility Corporations. PREVENTION OF ACCIDENTS AND BREAKDOWNS should be the first consideration in street railway power plants. Cranecast steel valves and fittings cost more, but they cannot be rupturedunder any conditions met with in practice, and the extreme high temper-atures of superheated steam do not affect them. Then, too, steel valves andfittings are cheaper in the long rvn, as they last indefinitely without repairs. CRANE STEEL VALVES These valves have pure nickel seats and nickel-steel stems. As nickel has the sameco-efficient of expansion as steel, seats cannot work loose. Nickel does not deteriorateunder excessive temperatures, while bronze and other alloys fail at about 600 Fahren-heit. With proper usage the stems and seats should last as long as valve bodies. All parts of our steel valves are made in ourown works under the most rigid inspection andtests, which insure castings of uniform quality. We solicit correspondence regardingsteel valves and fittings. CRANE CO. CHICAGO ESTABLISHED 1855 Ap
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
