UTILIZATION OF THE FISH WASTE OF THE PACIFIC OCEAN. 37 



In considering the first objection it becomes evident that the larger 

 the rendering plant the larger must be the equipment in tugs and 

 scows and the longer the haul. The irregularity with which the can- 

 neries operate and the vagaries of the weather introduce elements of 

 uncertainty which make it difficult to calculate the probable limits 

 within which the waste profitably can be collected. 



COLLECTING THE MATERIAL. 



Loading the waste. — Three methods are available for loading the 

 cannery waste: (1) By means of a scow under the dock at each can- 

 nery; (2) by means of a storage bin under the dock at each cannery; 

 (3) by means of a storage bin on the dock at each cannery. 



(1) The first method is objectionable in that the outlay for scows 

 would be too great. Two would be required for each cannery, one 

 receiving a load while the other was being unloaded. A scow 30 by 

 16 feet in dimensions would cost about $300. The investment in 

 these would be $600 for each cannery tended. Smaller scows de- 

 signed to hold the maximum daily output in waste of the cannery 

 could be built, perhaps, for a smaller sum, but their usefulness for 

 other purposes would be restricted. 



A contract between a cannery and a central rendering station most 

 probably would specify a daily removal of waste. Certainly there 

 would be days when the yield in cuttings would be small, far too 

 small to fill a scow. Yet under the contract and this system of col- 

 lecting it would be necessary to remove the partially loaded scow and 

 transport it to the rendering station, or else carry it away for 

 emptying. And even if the daily collection were not required, in 

 warm weather a frequent collection would be absolutely essential and 

 easily might result in the enforced transportation of but partially 

 filled scows. 



The greatest advantage to accrue from this method would be that 

 the waste could be sluiced directly from the cannery floor or cleaning 

 tables into the scow and would be ready for transportation without 

 any further handling whatever. On the other hand, an occasional 

 cannery would be found to have been built too close to the surface of 

 the water to admit of the loading of a scow in this manner. 



In a foregoing paragraph has been described the method of load- 

 ing, by a simple system of conveyors, when the cannery floor is too 

 low to admit of the scow's being placed beneath. Where such an 

 apparatus has to be installed and operated, the advantages of the 

 direct loading into a scow disappear. 



(2) Under ideal conditions the collection of the waste in storage 

 bins placed beneath the cannery floor or dock is the most economical. 

 The conditions considered ideal are that the cannery floor or dock 

 shall be of such a height that the scow to be loaded can be placed 



