344 



COALFIELDS AND COLLIERIES OF AUSTRALIA. 



Electricity is used at this colliery for hoists, pumps and 

 lighting. Only low tension current, of 220 volts, is employed. 

 The cables are led down the little tunnel. The original elec- 

 tric plant consisted of a Westinghouse direct current, 4 pole 

 generator of 45k. w., driven by a compound Westinghouse en- 

 gine provided with a fly-wheel governor. This has been 

 superseded by a Siemens Bros.' direct current, 6 pole gene- 

 rator, compound wound, of 200k. w., driven by a Bellis and 

 Morcom engine of 300 h.p. It has a belt driven automatic 

 cylinder lubricator, a gauge for the pressure of oil on the bear- 



Fig. 215. Tension Pulley. 



ings, the pressure being kept at 15 to 201bs., and another 

 gauge for the pressure of steam in the cylinder. A Worth ing- 

 ton oil separator, condenser and heater, are used. The oil is 

 separated in a vessel with baffle plates ; then the steam passes 

 through 640 brass tubes, about jin. in diameter, cooled by pit 

 water, which circulates round them. The condensed water 

 then goes to a heater warmed by exhaust steam from ihe con- 

 denser pump. Tn the power-houses are installed a Belliss-Sie- 

 men's 200k. w. set, and a Westinghouse 45k. w. set; also a 

 switchboard made up of two generator panels and three feeder 

 panels, having two 200 amp. feeder circuits. 



