﻿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 we'll 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 



