A. two-rail slide was built extending from the main floor of the 

 cannery down into the gurry bin situated beneath the floor. The 

 slide was placed so that the whole waste from the "Iron Chinks" would 

 drop into a movable basket. The basket, of about 5-gallon capacity, 

 was 18-1/2 inches long, 16-1/2 inches wide, 9 inches deep, and was con- 

 structed of l/4-inch mesh wire screen. Screen of this mesh was suffi- 

 cient to permit adequate drainage and yet to retain the solid materials. 



In order to determine the representativeness of the material col- 

 lected, several basket loads of the whole waste were separated into 

 their unit parts, e.g. head, tail, eggs or milt, liver, etc. The ratio 

 of these parts was found to be very nearly 1:1:2:1, etc., for each 

 basket load. This indicated that a fairly representative sample was 

 being collected. 



The waste was removed from the basket and poured into 5-gallon 

 liver cans which were frozen and stored at 0° to -20°F. V.Tien needed 

 the cans of waste were removed from cold storage and allowed to thaw 

 in the open air at room temperature. 



Equipment Used 



Three different pieces of equipment were used to vary the particle 

 size of the raw waste: A California Press Grinder, No.B-12067, with 

 7/8-inch hole plate, powered with a 15 hp. electric motor; a Hercdles 

 Meat-Bone Chopper, powered with a 1-1/2 hp. electric motor; and a 

 Rietz Disintegrator, Model RD-8, using a l/8-inch hole screen ?nd pow- 

 ered with a 5 ^P. electric motor . 



An upright iron retort 25 inches in diameter and 30 inches in height 

 was used as the digester. Steam under a pressure of 40 pounds was in- 

 troduced into the digester through two 3/4- inch pipes located on op- 

 posite sides of and at the bottom of the digester. The stirring appa- 

 ratus was built into the digester about 4 inches above the bottom in 

 a horizontal position and consisted of two blades, aae 7-1/2 inches in 

 length and the other 5-1/2 inches in length, mounted on a 3/4-inch steel 

 rod. The stirring apparatus was powered by a 1 hp.l750 rpm motor with 

 a driving; ratio of 2 to 1, rotating the stirring propellers at about 

 875 rpm. 



A DeLaval Centrifugal Oil Purifier, Model No. 302, was used to sep- 

 arate the oil from the liquor upon completion of the digestion. 



General Procedure for Allvali Digestion 



The general procedure used in all of the experiments except for 

 certain variations which will be described later was as follows: 



100 



