172 Bulletin 66. 



Weight of milk separated 582 lbs. per hour. 



Power absorbed by separator running empty 107 Horse Power. 



■ Power absorbed by separator when separating 150 Horse Power. 



The remaining three separators have each two countershafts. 

 (6). The Combined Separator and Accumulator by the Swedish 

 Cream and Butter Separator Co., Bainbridge, N. Y., was run in 

 both its capacities, but no diflference in the power required was 

 observed. The power absorbed by each of the countershafts was 

 separately measured. Data are as follows : 



Weight of milk separated 240 lbs. per hour. 



Power absorbed by separator and countershafts, 



running empty 1.08 Horse Power. 



Power absorbed by separator and countershafts 



when separating 1.115 Horse Power. 



Power absorbed by the two countershafts 287 Horse Power. 



Power absorbed by first countershaft 096 Horse Power. 



Power absorbed by second countershaft, or inter- 

 mediate 191 Horse Power. 



Power absorbed by separator alone when running 



empty 793 Horse Power. 



Power absorbed bj' separator when separating 828 Horse Power. 



(2). The Victoria Separator, manufactured by Watson, Laidlaw 

 & Co., Glasgow, Scotland, The Dairymen's Supply Co., Phila- 

 delphia, Pa., agents, gave the following results: 



Weight of milk separated 702 lbs. per hour. 



Power absorbed by separator running empty i-Sss Horse Power. 



Power absorbed by separator when separating 1.948 Horse Power. 



(5). The remaining separator was the Columbia No. i, manu- 

 factured bj' the Columbia Separator Co., Avon, N. Y., from 

 which the following data were obtained : 



Weight of milk separated 353 lbs. per hour. 



Power absorbed by theseparator running empty. ...i. 100 Horse Power. 



Power absorbed by the separator when separating...!. 124 Horse Power. 



The above results show a somewhat surprising variation in the 

 mechanical efficiencies of the separators tested. The power re- 

 quired to drive two of the machines, No. 4 and No. 2, of not very 

 different capacities, is seen to be .15 and 1.95 horse power re- 

 spectively, a variation large enough to arouse a suspicion as to 

 the accuracy of the results, were it not that the other tests show 

 a gradation in power required, between these two values. 



The friction of the machine is seen to absorb in each case the 



