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Results of Windmill Tests. 
| Ola pe NY (CH) 8) Ry 
In Vol. 4, No. 2 of the Kansas University QuarTeRLy the writer 
gave the results of some tests of windmills which he made during 
the summer of 1895. These tests were made with inferior instru- 
ments—the only ones then at his disposal—and on small mills op- 
erating small pumps raising water mainly for stock purposes. 
During the summer of 1896 with much better instruments fur- 
nished by the Hydrographic. branch of U. S. Geological Survey, he 
has continued this work testing the large steel mills working large 
pumps and raising the water for irrigating purposes. 
We have also extended the work to include ‘‘power’ 
pumping mills. In this paper we wish to give some of the results 
’ 
as well as 
of these tests, and conclusions to be drawn from them. The com- 
plete discussion of results will be found in the forthcoming report 
of the writer on ‘‘Windmills for Irrigation Purposes.” 
During the season of ’95, wind velocity was measured with a small] 
anemometer held on a board at the height of platform of mill. The 
number of strokes per minute were counted. In’g6 the wind ve- 
locity was measured with a U. S. Weather Bureau cup anemome- 
ter placed on a pole out of the influence of mill and at the height of 
axis of wind wheel. Each mile of wind and also the number of strokes 
of pump were recorded electrically on a two pen register. The re- 
sults of the tests of pumping mills are given in Table I. Examin- 
ing these results the following conclusions may be drawn: 
(1). The power of pumping windmills or the useful work they do 
is small. None of those tested gave more than .65 of a horse power 
in a 30 mile wind. 
(2). All mills of the same size are not doing the same amount of 
work. No. ri for example, is doing twice as much work in a 30 
mile wind as No. 3. The chief reason for this is the difference in 
the load on the mill or the number ft. Ibs. of work per stroke of 
pump. The influence of load on power of mill will be shown in 
tests of power mills. 
(89) KAN. UNIV. QUAR.. VOL, VI, NO. 2, APRIL, 1897, SURTES A 
