50 BULLETIN 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 i. $700 
Press 550 
Driers. 2, at $600 '___ 1,200 
Engine to operate driers 350 
Incidentals 1 1, 000 
House 2,000 
Total 5, 800 
OPERATING 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. 
