147A CREAMERY BUTTER MAKING 



six inches of solid waste at the surface in the first section, 

 but the amount in the second section was less than one 

 inch. 



Construction of Tank. The general plan of construc- 

 tion is illustrated in Figs, i and 2. Fig. I shows a longi- 

 tudinal view of the tank, while Fig. 2 shows a cross sec- 

 tion, or bird's eye view of it. It is located in the ground 

 with the top within a foot or two of the surface. For 

 durability the tank is preferably constructed of brick, 

 stone or concrete. 



The tank should be built air tight, except in two places, 

 D and E. At D is an air inlet, consisting of a goose-neck 

 pipe, which renders the vent at E more effective. This 

 vent consists of a long shaft extending beyond the top of 

 the creamery, thus carrying off the foul gases caused by 

 the decomposition of the material within. One-inch gas 

 pipe, properly fastened, will serve as a satisfactory vent. 



In order to afford communication of sections A and C 

 with the vent E, the two partitions should not be built 

 quite as high as the tank. There should be at least one 

 inch space between the top of the partition and the cover. 

 A i ]/2 -inch gas pipe should be laid over the tank 

 through which the water from cream vats and starter can 

 may be discharged directly into the drain at K. This 

 water requires no purification, and, if conducted through 

 the tank, would necessitate one of too large dimensions. 

 Moreover, the large amount of cold water needed for cool- 

 ing cream and starter would cool the contents of the tank 

 too much for a rapid decomposition of the material within. 



Size of Tank. This must necessarily depend upon the 

 amount of sewage run into it. It should have capacity 

 sufficient to hold all of one day's waste in the smallest 

 section (C). It will be noticed from the cut that section 



