UTILIZATION OF THE FISH WASTE OF THE PACIFIC OCEAN. 45 



per hour. Such a high capacity is suggested in order that it may 

 be insured that the steam required for cooking can be supplied by 

 the cannery boilers. It is believed that the requisite steam surely 

 can be withdrawn from these for a period of 6 hours out of the 24. 

 This appears especially probable in view of the fact that the cannery 

 is shut down almost invariably during some period of the day, and 

 that while still running a varying demand is made on the steam 

 capacity of the boilers. As has been observed in a foregoing para- 

 graph, the dressing force may be at work and the machinery which 

 they tend may be in operation when the steam boxes and cooking 

 retorts, requiring a large amount of steam, are idle. If it can be 

 shown that sufficient steam is available to operate the cooker for a 

 longer period than the 6 hours suggested, the capacity of the render- 

 ing apparatus, and perhaps its cost, can be reduced proportionately. 



In addition to the three above-mentioned pieces of apparatus, 

 there would be required conveyors, a storage bin to receive the day's 

 supply of raw materials, vats in which to recover the oils and stor- 

 age capacity for the oils produced, and a house sufficiently large to 

 inclose the apparatus and provide room for bagging and storing 

 the output of dry scrap. 



Unless the conditions are such that the waste can be sluiced 

 directly, by gravity, into the storage bin, a conveyor must be pro- 

 vided to carry this from beneath the floor of the fish-cleaning house. 

 The structure of this will depend on the angle at which it is required 

 to work. Thus, if the conditions are such that a horizontal con- 

 veyor can be operated, all that is needed is a water-tight trough 

 through which pass blocks or boards of wood, suitably attached to 

 and actuated by the movement of a chain belt, to direct the flow 

 of the waste and the water in which it is immersed. The cuttings 

 from the " iron chink " may be made to fall into a hopper placed 

 beneath, which deposits the waste upon the conveyor; likewise that 

 from the other cleaning operations may be directed, in any suitable 

 manner, upon the conveyor. From the storage bin the material is 

 to be lifted by elevator and fed into the retorts. Therefore the bin 

 should be constructed with a sloping bottom so that the last of the 

 material contained therein will feed automatically into the con- 

 veyor. Strainers of woven wire should be inserted in the sides of 

 the bin to permit the excess water to drain away. To accommodate 

 the day's output in waste the bin must have a capacity of about 

 20 tons. 



Two retorts of the upright, cylindrical form should be provided 

 of about 5 tons capacity each, two offering the advantage over one 

 of greater elasticity of operation. The daily output in waste of a 

 one-line cannery, amounting to about 18 tons, could be rendered by 

 the two retorts of the capacity suggested in two cookings each. 



