ABERDARE COLLIERY. 363 



a head of 500ft. per hour. It will be rope driven from u 90 h.p. 

 electric motor, built by Scott and Mountain, of Newcastle-on- 

 ly ne. 



There are eight inultitubular boilers by A. Groninan and 

 Co., and one Lancashire boiler by John Thompson, of AVoiver- 

 hainpton, England, designed with corrugated ilues, for a 

 working pressure of 15Ulbs. This boiler is used for the power- 

 house only, b'eed water is pumped from a dam half a mile 

 away by an electrically driven Tin. by 6in. three-throw pump 

 controlled from the mine. Two old egg end boilers are used a 

 treatment tanks for where they are obliged to use pit water, 

 and as water heaters where fresh water can be obtained. 



The fitting shop is provided with a planing machine, 

 screwing machine, drilling machine, and lathe. 



The blacksmith's shop has four forges, the air for which 

 is supplied by a blower worked oil: a belt by an electric motor. 

 There is also a shearing and punching machine, and a steam 

 hammer. 



Other buildings include a carpenter's shop, electric fitting 

 shop, store, etc. 



The power-house contains an Aines high speed engine, 

 which belt drives a 500 volt continuous current generator made, 

 by the General Electric Company. This is used to work a 95 

 h.p. motor direct coupled to a Worthingtoii five stage turbine 

 pump, which is used for pumping from the sump at the bottom 

 of the shaft to the surface. 



Two sets of Bellis and Morcom high speed engines are 

 direct coupled to British Thompson-Houston 100k. w. 250 volt, 

 generator, used to supply power for coal-cutting, pumping, and 

 lighting. 



One set of Ernest Scott and Mountain's hii>ii speed engines 

 are direct coupled to a 200k. w. 250 volt generator. 



The three latter generators will be replaced by three sets 

 of high pressure, 2200 volts, 3 phase machines,' and there 

 will be four sub-stations underground, each of 10()k. w. Each 

 sub-station will consist of a 150 h.p., 2200 volt, three phase 

 motor, direct coupled to 100k. w., 250 volts generator, for low 

 tension distribution in the pit to coal cutters and pumps. 



In the same building is an auxiliary winding engine for 

 the air shaft, and the main and tail rope engine. 



The main low tension electric cable is passed down the 

 shaft, and is clamped to an old winding rope every loft., which 

 serves as a support. 



The high tension cable is placed in an iron pipe on the far 

 side of the shaft. The pipe is clamped to the wall. At the top 

 of the shaft are boxes for connecting the shaft-cable with the 

 surface-cable. 



