FEATURES OF ENGINEERING INTEREST 85 



Messrs. J. Terry & Sons, Ltd. 

 The power plant services at Messrs. Terry's works comprise : 

 (i) Electricity. — Obtained from the York Corporation at 6,000 volts 

 A.C. 



(2) Steam. — For process work, etc., provided from water-tube boilers 

 of the Babcock type. 



(3) Refrigerating Plant. — Two ammonia compressor units together 

 with water cooling towers. 



(4) Air Conditioning Plant of the Premier type. 



(5) Water Supply Services. — Partly from city supply and partly obtained 

 by means of centrifugal pumps from the river. 



Messrs. Henry Briggs, Son & Co. Ltd., Whitwood Collieries. 



Savile Pit. 

 Modern screening plant, new headgear and Heapstead winding engines, 

 ambulance room, etc. Air locks where the ordinary air of the surface is 

 kept separate from air which has travelled round the mine workings. At 

 the pit bottom a new method is employed for supporting the roadways 

 by means of steel arches and reinforced concrete. In some parts of the 

 actual coal face compressed air driven coal-cutting machines are employed. 

 A visit has been arranged to this pit, for an inspection underground, for 

 a limited number only. 



Messrs. Henry Briggs, Son & Co. Ltd. Whitwood Silkstone Pit. 

 The new power house at this colliery contains two turbo alternators 

 generating power at 3,300 volts, one a mixed-pressure unit and the other a 

 high-pressure unit. There is also in the power house one of the latest 

 i2-stage turbo air compressors. Simultaneous decking is in use in the 

 large shaft, whereby a great saving of time and consequent increase in the 

 capacity of the shaft is obtained. There are four main jigging screens 

 which are fed by power-driven tipplers. The washery is used for washing 

 medium-sized coal, and an Ariel flight is used for taking away the dirt 

 rejected during the process of washing. Some idea of the magnitude of 

 this colliery is given by the fact that its sidings aggregate about 40 miles. 



i^'oRKSHiRE Coal Owners' Association. Wakefield Rescue Station. 

 From this station, which has its permanent staffs with a resident super- 

 intendent, a rescue team complete with self-contained breathing apparatus 

 can proceed to a colliery at a moment's notice. The apparatus for dealing 

 with underground fires and for the actual rescue work after colliery 

 explosions can be seen, and there are also model underground galleries 

 representing a mine, which are used for training men in this dangerous 

 work. 



City of Leeds Electricity Department, Kirkstall Power Station. 



The new Kirkstall Power Station of the Leeds Corporation is a 

 ' selected ' generating station under the auspices of the Central Electricity 

 Board. 



