. Electric railway journal . losses are relatively greater in smallplants than in large ones, owing to the fact that small boilers, cylinders and pipes expose more surface per pound ofsteam carried than large ones. To equip a small plant witheconomizers, condensers, superheaters, etc., is not oftencommercially feasible since small apparatus of this classis usually much more costly per horse power than that usedin large plants. 1298 ELECTRIC RAILWAY JOURNAL [Vol. XLII, No. 25. NEW PORCELAIN STRAIN INSULATORS CORDLESS JACK BOXES FOR WAY-STATION SERVICE To meet the severe requirements due to the
. Electric railway journal . losses are relatively greater in smallplants than in large ones, owing to the fact that small boilers, cylinders and pipes expose more surface per pound ofsteam carried than large ones. To equip a small plant witheconomizers, condensers, superheaters, etc., is not oftencommercially feasible since small apparatus of this classis usually much more costly per horse power than that usedin large plants. 1298 ELECTRIC RAILWAY JOURNAL [Vol. XLII, No. 25. NEW PORCELAIN STRAIN INSULATORS CORDLESS JACK BOXES FOR WAY-STATION SERVICE To meet the severe requirements due to the increasingweight of overhead construction two new types of porcelainstrain insulators have been developed by the WestinghouseElectric & Manufacturing Company. These are a combi-nation of a metal cap to give the necessary strength and aporcelain skirt to furnish the required dielectric he metal parts of these insulators consist of a malleable-iron cap, a drop-forged steel eye bolt, and a malleable- Cctte Clip:. Application of Porcelain Strain Insulators to SectionInsulator iron sleeve by which the eye bolt is securely fastened. Themetal and porcelain parts are cemented together with ahigh-grade Portland cement. The cemented surfaces areprovided with carefully determined corrugations which pre-vent failure, except by the actual shearing of the skirt of the porcelain is provided with corrugations onthe under side to give additional creepage surface. Two types of these insulators are made,the PK and the PK-i. The metal parts ofthe type PK insulator are sherardized andthose of the larger size, types PK-i, arehot galvanized. The type PK insulator isespecially used for insulating cables whenthe working load does not exceed 1600 they are tested at 5000 lb., both typesare generally used for heavy service, suchas dead-ending high-strength steel mes- A simple switching device for connecting the operatorsset in a railroad way station to one or more lines passing
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