The Wallace Patent Milking Machine. 
83 
Fig. 3.— The "Wallace Patent Milking Machine (Article 2558). 
teat whilst suspended in a vacuum, and that thus the cows 
do not experience the uncomfortable sensation which would 
otherwise cause them to withhold their milk. 
A really good milking machine would prove a great boon to 
the large dairy farmer who, in these days, finds great difficulty 
in procuring good milkers by hand. The following are the 
essential points that should be observed in the construction 
of milking machines : ease of cleaning ; efficiency ; power to 
strip ; non-injuriousness to the cow ; simplicity of construction, 
either for the process of milking or for obtaining the vacuum ; 
cheapness. 
We arrived at the conclusion that in the short time at our 
disposal it was impossible adequately to test the machine in 
operates the motor, which in turn first admits the air" between 
the rubber cup and the outer casing, thus effecting an active 
emphatic pressure on the teat, and secondly causes a withdrawal 
of this pressure by coupling the space into which the air has 
been admitted to the interior of the cup. The pressing and 
relaxing action can be regulated to any required speed. 
The exhibitors state that the motors, which are furnished 
with cup leathers like an ordinary air or water pump, will last 
for years, and that the wearing parts are renewable at a small 
cost. They also claim that the effective intermittent pressure 
exerted allows of the natural circulation of the blood in the 
