. The Street railway journal . s. This sectioncan be connected to either the high or the low voltage by 246 STREET RAILWAY JOURNAL. [Vol. XXXL No. 7. a manually operated switch which is kept locked so that itcan be thrown only by an employee. Later it is proposed tothrow these switches from a signal tower. Each sectioninsulator so employed is provided with an inner insulatingrunner which serves for guiding a wheel trolley, and twoouter runners which were provided for use in case a panto-graph is adopted later. TELEPHONE AND OTHER CONDUCTORS The railway company maintains its own telephone circu
. The Street railway journal . s. This sectioncan be connected to either the high or the low voltage by 246 STREET RAILWAY JOURNAL. [Vol. XXXL No. 7. a manually operated switch which is kept locked so that itcan be thrown only by an employee. Later it is proposed tothrow these switches from a signal tower. Each sectioninsulator so employed is provided with an inner insulatingrunner which serves for guiding a wheel trolley, and twoouter runners which were provided for use in case a panto-graph is adopted later. TELEPHONE AND OTHER CONDUCTORS The railway company maintains its own telephone circuit. a potential rise at the instruments has been bridging phones are used with a 2000-ohm ringerand a 5-bar generator. At the top of the poles a No. 10 steel wire, grounded ateach fifth pole, is carried for lightning protection. BLOCK SIGNALS The Annapolis single track branch is equipped with Blakemanually operated block signals, made by the Blake Signal& Manufacturing Company, of Boston. The crossing at. 3 3, ■$ Barsj Elefat/on Typical Bait. Cross Section. SECTION AND ELEVATIONS OF REPAIR SHOP E/emnon Typica/ Bay. The telephone wires and the signal wires on the Annapolis the Academy Junction is protected by a block signal systembranch are carried on a cross arm below the bracket. To installed by the General Railway Signal Company and oper-provide against induction in the telephone wires the latter ated from a tower. The railway company has not yet se-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
