. Electric railway review . HLhNOFbOTTOMC- Ravenswod Extension of the Northwestern Elevated—Details ofThird-Rail Insulators. Ravenswood Extension of the Northwestern Elevated—Details ofGuard Rail Construction. ard form of screw spike with a square head, the engineersof the Northwestern Elevated have adopted a screw spikeof their own design. Heretofore the head of a spike wouldbecome worn, rendering it difficult to tighten, as the wrenchwould slip around on the head. To obviate this trouble thehead is made oblong in shape, so thai Hie wrench must allbe put on in one position. This prevents tin-

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. Electric railway review . HLhNOFbOTTOMC- Ravenswod Extension of the Northwestern Elevated—Details ofThird-Rail Insulators. Ravenswood Extension of the Northwestern Elevated—Details ofGuard Rail Construction. ard form of screw spike with a square head, the engineersof the Northwestern Elevated have adopted a screw spikeof their own design. Heretofore the head of a spike wouldbecome worn, rendering it difficult to tighten, as the wrenchwould slip around on the head. To obviate this trouble thehead is made oblong in shape, so thai Hie wrench must allbe put on in one position. This prevents tin- head becomingworn. A feature in the construction of tin guard rails on curves,which is worth; if particular note, ,s the securing of 0 1 combines simplicity with a low first cost. The insulator iscomposed of four malleable iron castings and a hard maplepin thoroughly boiled in paraffin. The iron castings are boltedtogether around the insulating pin and the third rail is boltedlo Hie top by two hook bolts fitted with sp

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906