86 SCIENTIFIC SURVEY OF YORK AND DISTRICT 



The ultimate capacity for which the station is designed is 

 200,000 kw., but at present only two units have been installed, each of 

 25,000 kw. The site is most favourably placed as regards fuel supply and 

 the provision of ample cooling water and has exceptional rail and canal 

 facilities. 



Pulverised fuel is used, mainly for the following reasons : 



(a) It enables a very cheap grade of fuel to be burnt. 



(b) It confers a flexibility in steam generation almost equal to that 

 obtainable with oil. 



(c) It allows of the use of very large and efficient boiler units (15,000 kw. 

 each). 



(d) Combustion is so perfect that atmospheric pollution by carbon is 

 impossible. 



(e) The fact that the pulveriser plant is on a separate site of large area 

 allows of the adoption of coal-treatment plant for the extraction of bye- 

 products should this be found in the future to be desirable. 



The boilers are of the Stirling type and work at a pressure of 475 lbs. 

 per sq in. They are provided with superheaters giving a temperature of 

 750° F. The combustion chambers have water-cooled rear and side walls 

 with a water-screen above the ash pit to cool the ash particles below 

 fusing point before they settle. Economisers and regenerative air-pre- 

 heaters are provided. Dust-extractors of the centrifugal type preserve 

 the high standard of atmospheric purity obtaining in the locality. 



The generating units are of 25,000 kw. each and run at 3,000 R.P.M. 

 The high-pressure stages (16 in number) are of the impulse type and the 

 lower pressure reactive. The low-pressure stages are arranged on the 

 double-flow principle so as to secure axial balance. 



The alternators generate at 11,000 volts, but some of the power is trans- 

 formed to 6,600 volts for linking up with the older station at Whitehall 

 Road, while a portion is raised to 132,000 volts in the adjacent Central 

 Electricity Board Transformer Station. 



Yorkshire Post : Works and Offices. 



The following are the chief departments : 



Telegraph Room — containing Murray-Multiplex machines on which 

 five different news stories are received simultaneously over a single 

 private wire from London. 



Telephone Room — where telephonists take news stories direct from 

 district correspondents on to the typewriter. 



Sub-Editors' Office — where copy is received from the reporters and from 

 the telephone and telegraph rooms by overhead automatic conveyors and 

 arranged by the sub-editors in the form to appear in the paper. 



Half -Tone Room — where blocks are made for reproduction of news 

 pictures, cartoons, etc. 



Case Room. — Here the news is set in type on 56 linotype machines, 

 which are available for complete explanation and demonstration. There 

 is also a Ludlow machine on which large display type headlines for news 



