NEW CALIFORNIAN STAMPS AT DOLCOATH. 41 



Much less time is occupied in changing the heads and in 

 stopping for repairs. 



The consumption of fuel as compared with power shown by 

 indicator diagrams is 2*38-lbs. of coal per indicated horse power 

 per hour — being equal to a duty of 70 millions of pounds 

 lifted one foot high by the consumption of 112-lbs. of coal.' 

 The output of tin stuff of ordinary size and hardness is about 

 2 tons per head in 24 hours when the stamps are kept fully at 

 work — the consumption of coals being about 2 tons for the 40 

 heads. This is about twice as much stuff per head as is stamped 

 by the average Cornish stamps with about the same quantity of 

 coals. 



The whole of the plant was supplied by Messrs. Harvey & 

 Go., of Hayle. It was ordered on June 13th, 1892, and together 

 with the dressing floors was completed and set to work on 

 November 28th, 1892. 



