Deerfoot Farm Centrifugal Dairy. 
485 
On account of the novelty of this system, it seems well to 
devote some space to theoretical and practical considerations 
upon this method of dairying, and in the proper place to con- 
sider the advantages which are claimed, and such as may be 
admitted to belong to it. From the nature of the material in 
use — milk — and from the character of the forces employed, it 
must happen that the observations of different reporters must vary 
according as there is variation in the milk, in the forms of the 
machines in use, and the speed at which they move. This we will 
proceed to do before we pass to the utilising of cream for butter. 
Tlieoretical and Practical Observations — Centrifugal Cream 
Raising. — The value of this process in saving more of the butter 
from milk than the ordinary methods of setting milk has not 
been systematically shown by Mr. Burnett, although a few ex- 
periments indicate a gain, which will be figured further on. In 
an excellent summary of European experiments by Dr. T. R. 
Englehardt, he offers the results of European determinations 
between the centrifugal raised cream, and that obtained by the 
ice and Holstein method. Two hundred pounds of milk were 
used for each experiment, and the correctness of the obtained 
results were verified by chemical analysis of the butter, butter- 
milk, and skim-milk obtained in the operation. The vessels 
for the ice method held 50 lbs. of milk each, and were filled to 
the depth of 16 inches; time employed, 34 hours. The centri- 
fugal used was the Lefeldt machine, running 1040 revolutions per 
minute, except from August 8 to September 2, when its motion 
was irregular, and after this date was reduced to 950 revolutions 
per minute. At the higher speed 31 minutes, at the lower speed 
o6i minutes, were occupied in the gaining of the cream. 
PorxDS of Milk per Oxe Pount) of Buttee. 
Date. 
Centrifugal. 
Ice, 38 hours. 
Holstein 
Method. 
1879— May 
August 1 and September 2 
1880— January 
27- 6 
26-4 
26-8 
28- 5 
26-6 
24-3 
24-6 
24- 2 
25- 8 
26- 4 
27- 8 
29- 3 
30- 0 
28-3 
28-0 
27-7 
27- 6 
28- 7 
31- 5 
28-5 
27-8 
27- 4 
28- 8 
28-4 
30-4 
28-8 
30- 5 
31- 7 
30-9 
27- 9 
28- 4 
27- 4 
28- 0 
27-8 
29- 5 
301 
26-5 
28-5 
29-2 
