The Trials of Churns at Cambridge. 
495 
Diagram C. gives curves of the “Disc” and “Fishback” Churns 
when tested with 6 quarts of cream. 
As in the previous — 
class, the success of the 
Prize Churns in Class 
VII. turned on precisely 
the same points, namely, 
excellence of butter pro- 
duced, and superiority of 
construction and general 
convenience of the churns. 
These points more than 
outweighed the special ad- 
vantages possessed by the 
quick-churningmachines. 
The third prize machine 
in Class VII. is illustrated 
in fig. 4. 
In the Diagram A, B, 
C the time taken — which 
was that recorded by the 
Judges when the churn- 
ing was complete — is in- 
dicated in minutes by the 
figures along the hori- 
zontal base line, and the 
amount of power expended 
at any particular time by 
the irregular upper line of 
each diagram. The power 
was measured by driving 
each churn with an elec- 
tric motor, readings being 
taken at short intervals 
of the amount of current 
used ; so that the several 
points of the diagram 
fairly represent the 
amount of work ex- 
pended at any given 
moment. The figures on 
the vertical scale are the 
measure of work equiva- 
lent to the number of pounds lifted one foot high. 
Regarding the diagrams generally, it will be noted that 
Fig. 2. — Llewelliu's “Ecceutric End Over” Churn. 
Fig. 3 . — Llewelliu’s “ Royal Triangular ” Churn. 
