138 PROCEEDINGS OF SECTIOX B. 



He gives £5 1 Is. a ton for tlie best situated works, and £7 6s. 7d. 

 for those less favourably situated. 



Approximate Edimate of Cost of Producing GOOO Tons of Carbide, 

 by E. Kilburn Scott. £ 



Electric power, 5,000 E.H.P. £2 15 .'.. 13,750 



Coke, 4,000 tons £10 ... 4,000 



Lime, 6,000 tons £0 18 ... 5,400 



Electrodes, per ton output £0 10 ... 2,500 



Miscellaneous Items. 



Refractory bricks for furnaces, iron casings for 

 electrodes, oil, waste, belting, &c., current 

 for motors and lighting, at 10s. per ton out- 

 put 2,500 



Management and office expenses, skilled labour 

 (foremen, fumiace and crushing room men, 

 smith and cai-penter), unskilled labour, at 22s- 

 6d. per ton output ... ... ... ... 5,625 



Rates, taxes, and insurance, repairs and mainten- 

 ance, at 15s. per ton output ... ... ... 3,750 



Allowance for depreciation, 5 per cent, on £25,000 1,250 



Equal to, say, £7 15s. per ton. 



£38,775 



It will be noticed that the price for power is taken at £2 15s. per 

 electrical horse-power year, this being a firm offer by the Queensland 

 Government to the promoters of the carbide factory. 



As a matter of fact, this price is higher than in Norway. At 

 Sarpsfos, for example, the price is £2 7s. 6d., and at the new works 

 of the Birkland Eyde Fixation of Nitrogen Works the record figui-e 

 of 15s. per electrical horse-power year is said to be attained. 



Manufacture by Intermittent Furnace. 



There are three forms of furnace at present in use^ — namely, the 

 Interinittent, as invented by Willson, and used at Foyers and 

 Meraker in Norway, amongst other places; the Continuous funiace, 

 by Dr. Rathenau, as used at Rheinfelden, in Germany; and the Eotat- 

 ing funiace, invented by Bradley and Horry, and used at Niagara. 



The modern intermittent furnace consists of a steel truck lined 

 with magnesite, and mounted on wheels. The upper carbon is drawn 

 up automatically by a small motor, which is controlled by a solenoid 



