. The Street railway journal . at Cali-fornie for supplying the line toCannes and the other at Beaulieufor supplying the line to MonteCarlo. As already mentioned, the sub-station at Nice contains the aux-iliary steam plant. This includestwo 700-hp double cylinder Corlissengines belted to the motor gen-erators and two batteries of fourboilers each. The latter are semi-tublar, having a heating surface (if185 sq. m (1991 sq. ft.) and a ca-pacity of 20,000 kg (44,000 lbs.) ofsteam per hour. The diameter ofthe engine cylinders is 50 cm( ins.) and the stroke m ( ins.) Theyrun at 100 r
. The Street railway journal . at Cali-fornie for supplying the line toCannes and the other at Beaulieufor supplying the line to MonteCarlo. As already mentioned, the sub-station at Nice contains the aux-iliary steam plant. This includestwo 700-hp double cylinder Corlissengines belted to the motor gen-erators and two batteries of fourboilers each. The latter are semi-tublar, having a heating surface (if185 sq. m (1991 sq. ft.) and a ca-pacity of 20,000 kg (44,000 lbs.) ofsteam per hour. The diameter ofthe engine cylinders is 50 cm( ins.) and the stroke m ( ins.) Theyrun at 100 r. p. m. There are two feed-pumps, one simpleand the other compound, and a feed-water heater whichuses the exhaust steam. The steam piping is mostly cov- 630 STREET RAILWAY JOURNAL. [Vol. XVI. No. 27 ered with a non-conducting packing and the steam pres-sure is 10 kg per sq. cm (142 lbs. per sq. in ) There aretwo brick chimneys, one for each battery of boilers, 40 m(131 ft.) high and 2 m ( ft.) internal diameter at the POLE WITH LONG BRACKET The illustration of the sub-stations interior shows themanner in which the engines ar*e belted to the motor gen-erators. These are two in number and consist of a 530-kwsynchronous motor direct connected to a 500-kw com-pound railway generator. The synchronous motor receivesthe current directly from the Mescla transmission line ata pressure of 9000 volts. The generator has an e. m. f. of500 volts at no load and 550 volts at full load. The speedis 300 r. p. m. The four-pole exciter for the motor, seenbelted to the common shaft, is a 25-kw, 60-volt machineturning at noo r. p. m. There is one for each group ofmotor generators. There are also in this station two rotary converters, forwhich the required e. m. f. of 340 volts on the alternatingside is obtained by means of six static transformers. Thethree-phase transmission to Californie and Beaulieu at5000 volts is supplied by six 55-kw transformers in twosets of three each. These lines
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