360 IOWA DEPARTMENT OF AGRICULTURE 



could not get as satisfactory churn results with cream cooled with ice 

 direct. It is almost impossible to properly emulsify the fat globules 

 with a paddle, particularly so if the cream contains very much water. 

 We could not churn as exhaustively with ice-cooled cream. We als© 

 found we could save 5 to 75 pounds of ice per day by circulating a 

 strong salt and ice brine through the coils, to say nothing of the better 

 churn results. 



In these two features alone — cooling the cream and pumping water 

 v/e are saving enough coal to pay for the engine in three months. 



The little engine did such noble work that I decided to operate all 

 my machinery with gasoline power, which consists of three 3,000 

 pound separators, one 900-pound churn, deep well pump, milk heater, 

 starter can and cream ripener. In order to find the size engine we could 

 use with the most satisfaction and economy, and to be in position to 

 recommend the proper size, I have been experimenting with a 6-horse 

 engine. At first thought you will say it won't even run the churn, 

 but it not only run the churn but it run all the other machinery and 

 did it all at one time. However, it required continuous explosions, 

 which is neither economical in the amount of gasoline consumed or 

 on the durability of the engine. It run the three separators alone 

 satisfactorily and held them at a speed of 6,200 as uniformly as any 

 steam engine could possibly do. It has been running the churn ever 

 since we put it in until a few days ago. One has to be equipped to 

 run all the machinery at once in case of emergency, so I would not 

 recommend a 6-horse engine for a creamery operating separators. I 

 am getting ready to put in a 10-horse engine and can recommend that 

 size for a creamery running from three to five separators. If you 

 only have one separator, the 6-horse engine will do the work satis- 

 factorily and economically. 



I can recommend a 6-^horse engine for an ordinary cream plant. 

 I think that size plenty large enough, and it will furnish an abun- 

 dance of power at a minimum cost. 



At the present time we are using our big boiler for heating 

 purposes only, and by so doing we are reducing the amount of fuel 

 consumed just as nearly 50 per cent as we can figure. The cost of 

 operating the 6-horse engine on an average of six hours per day is 

 3 2 cents, figuring naptha at 8 cents per gallon. I have ordered a 10- 

 horse upright boiler for heating purposes, and as soon as it is in- 

 stalled I will be able to give you figures that will be as small com- 

 pared to the big boiler as I have given you figures for power cost. 

 I feel confident that with a 10-horse engine and a 10-horse boiler I 

 will reduce my power cost to not more than $15.00 per month. 



The size boiler which is the most economical for a cream plant, of 

 course, depends on the requirements. If you pasteurize your cream 

 it will take a somewhat larger boiler, but if you do not, a 3-horse 

 upright boiler will be plenty large enough to run your tester, heat 

 your water and for cleaning purposes, and it will do it with a mini- 

 mum amount of coal. 



