50 BULLETIX 150, U. S. DEPARTMENT OF AGRICULTURE. 



by 50 feet doubtless would be large enough, which could be erected, 

 perhaps, for about $2,000. In the following table the probable costs 

 are itemized : 



Costs of apparatus. 



Retorts, 2, at $350 $700 



Press 550 



Driers, 2. at $600 1,200 



Engine to operate driers 350 



Incidentals 1, 000 



House 2,000 



Total _- 5, 800 



OPEBATIXG EXPENSES. 



As the hypothetical plant is to be run at night, or at times when 

 the cannery boilers are not carrying their maximum load, it is prob- 

 able that an extra engineer and fireman would have to be employed. 

 In addition to these, three other laborers should suffice. At $100 per 

 month for this engineer and $75 each for the fireman and the three 

 laborers, the outlay for labor for the two months would be $800. 



To sack 115 tons dry scrap, putting 100 pounds in a sack, 2,300 

 sacks would be required. These, at 10 cents each (a price which in- 

 cludes the cost of the necessary string also), would amount to $230. 



From 750 tons of raw material, the amount rendered per season, 

 about 19,000 gallons of oil would be produced. To contain this vol- 

 ume 380 barrels, of 50 gallons capacity, would be necessary. These 

 are purchasable at $1.85 each, necessitating a maximum outlay of 

 about $700 for barrels. 



To render garbage, it is stated, 25 pounds of bituminous coal is re- 

 quired per ton of garbage rendered. On this basis, to render 750 

 tons of cannery waste, 9.5 tons of coal would be required. This 

 would cost, on the Alaska coast, $76 (9.5 tons at $8 per ton). An 

 additional outlay for coal, for estimating which reliable data are 

 lacking, would be occasioned by the operation of conveyors and 

 driers. 



An additional estimate, of doubtful value, of the amount of coal 

 necessary to dry the cooked scrap can be secured by considering the 

 actual amount of water to be evaporated in drying this and the quan- 

 tity of heat necessary to evaporate a given quantity of water. The 

 wet material coming from the presses consists of about 50 per cent 

 of water and 50 per cent of solids. To prepare 120 tons of dry 

 scrap, an equal weight of water must be evaporated. To evaporate 

 this in a closed vessel would require 12 tons of coal, on the basis of 

 1 part of coal to 10 of water. This would cost $96. 



A further item which must be considered in Alaska is freight 

 charges on products. 



