A Simple Problem in Arithmetic 
According to an investigation by the University of 
Illinois on 66 dairy farms, it was found that 133.9 hours 
per year were required to milk a cow by hand. A 
De Laval Milker will cut this time in two and save 
at least 62 hours per cow per year over hand milking, 
and at 15 cents per hour a saving of $9.30 per cow 
per year will be effected, which is equal to 6% of 
$155 for just one cow, or $1550 for ten cows, etc. 
This is a'very conservative way of figuring the 
value of the time-saving feature of a De Laval Milker. 
In actual use it may save a man; or 
if a man is still retained it may 
mean that more cows can be kept 
or that he can devote all his time 
to other work, the owner looking 
after the milking himself. Or it 
may mean that a boy or some other 
person not capable of doing much 
milking by hand, with the aid of a 
De Laval can take the place of a 
grown man. There are many situations impossible- to 
foresee that may justify the purchase of a De Laval 
Milker, and which often do save enough in other 
ways to pay for a De Laval in a year. 
But saving time is only part of the advantage of a 
De Laval Milker. Suppose a De Laval, because of 
its uniform, vigorous and stimulating action, will in¬ 
crease production 10%. Of course the De Laval 
Company can’t guarantee such an increase, as there 
are so many uncontrollable factors, such as health, 
feed, climate, care, etc. But practically all De Laval 
Milker users, and especially those who weigh their 
milk and know, do say they get more milk, taking 
the herd as a whole over a period of a year—some as 
high as 20%; and 10%, based on the results obtained 
by many users, seems conservative. Ten per cent of 
5000 pounds of milk per year—about the average 
production per cow per year — is 500 pounds, which 
at $2.20 per cwt., the average price of fluid milk in 
the United States delivered at country stations during 
1922, would be $11.00 per cow per year. Then add 
this to the value of the time saved, 
which is $9.30, and you will have a 
total gain of $20.30 per cow per 
year, due to the use of a De Laval 
Milker. Multiply this by 10, 20, 
30, or the number of cows you are 
milking by hand, and you get a 
very conservative idea of what a 
De Laval Milker really will make 
you in profit. 
In addition, when it is considered that cleaner 
milk can be produced, that the drudgery and dislike 
of hand milking are eliminated, and that dairying is 
made more pleasant for owner, son or hired man, you 
have the answer why so many people are installing 
De Laval Milkers—and especially when it is borne 
* in mind that a De Laval Milker can be bought on 
such liberal terms and such long time that it will 
actually pay for itself as it is being used. Full informa¬ 
tion can be obtained from your De Laval Agent, or 
by writing us at any of the addresses below. 
The 
De Laval Milker 
saves $20.30 
per cow per year 
The De Laval Separator Company 
NEW YORK: 165 Broadway CHICAGO: 29 E. Madison Street SAN FRANCISCO: 61 Beale Street 
See the De Laval Exhibit at the National Dairy Show, Syracuse, N. Y., October 5-13 
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