NORMAL DAY S WORK FOR VARIOUS FARM OPERATIONS. 9 
was increased. This was less pronounced with three horses than 
with two. Only the 10, 12, 14, and 16 inch widths had sufficient 
numbers reported to warrant conclusions. A progressive increase 
in the work done per day and per horse appeared as the width in- 
creased, but a much smaller increase per 1,000 pounds of horse was 
evident, since the heavier horses were used on the wider plows. 
With a 2-horse walking plow the average load is about 35 square 
inches in cross section, and 0.72 acre is required daily of each 1,000 
pounds of horse. 
With the 3-horse teams the depth averaged greater except in the 
case of the 16-inch width, which showed a smaller average depth 
than the 2-horse plow of the same width and a much greater acreage 
daily, as would be expected. Variations from what would normally 
be expected in the averages for these principal widths could nearly 
always be explained by some other features of the data, a consider- 
ation which augurs well for the unbiased method used in assembling 
the material and the general accuracy of the results obtained. With 
a three-horse walking plow the average load was about 25 square 
inches in cross section and 0.65 acre was required to be plowed daily 
by each 1,000 pounds of horse. 
Where the data for walking plows were arranged by depth with 
averaged widths, only the 4, 5, 6, 7, 8, and 10 inch depths contained 
sufficient numbers in the averages to give them value. There was a 
progressive decrease in the daily acreage as the depth increased, 
while peculiarities in the figures were accounted for by other elements 
of the table. Thus, the daily acreage for the 2-horse, 5-inch depth 
was greater than that for the 4-inch depth, but the width was 0.72 
inch greater and the horses considerably heavier. The averages per 
1,000 pounds of horse showed about the same decrease in the daily 
acreage with the increasing depth as did the acreage per horse, since 
the horses reported for each depth weighed nearly the same, although 
there was a slight tendency to increase the weight of the horses 
for the greater depths. 
In Table II the reported acreages for walking plows at the 6-inch 
depth have been arranged by the widths of plows reported and by 
the number of horses in the team. Adjusted factors for each 
reported width at the 6-inch depth have been computed and appear 
in the fourth column opposite the respective plowing units. In the 
fifth column is a scale of allowances for other depths than 6 inches 
for each width of plow, expressed in decimal parts of an acre. In 
the sixth column is shown the depths that can normally be plowed 
with each width and team without overloading. From columns 
4 and 5 the daily duty for any width of plow at any desired depth 
can be ascertained. Thus, if it is desired to know what may fairly 
be expected of two horses with a 14-inch plow cutting 9 inches deep, 
5774°— Bui. 3—13 2 
