34 
EMPLOYMENT PSYCHOLOGY 
Because of the nature of the eye test, only individual 
correspondences could be shown. Some of these will be 
mentioned later. It was plainly evident, however, that 
an inspector needed two very good eyes in order to succeed 
at this work. 
From the above figures, it can be seen that three tests 
show a correlation which is really significant. Two of 
these show a correlation of over .60 which is very good, 
and one shows a correlation of .56 which is also quite good. 
The significance of these correlations will be more ap 
parent if we compare them with those brought out by 
another section of this experiment. Besides giving the 
tests to girls engaged in visual inspection, the same tests 
were given to twenty-one girls engaged in gauging the 
head-thickness of shells. This work does not require the 
use of the eyes. The operator simply picks up a handful 
of shells and, with or without looking, tries the head of 
each shell on a gauge. The gauge is a piece of steel with 
two notches or openings. The shells which are too small 
pass through the first opening and fall into a box of re 
jects below. Those that do not pass through are tried on 
the second opening and, if they pass through, they are of 
the right size. If they fail to pass through, they are too 
large and are thrown aside. The operator sits in front of 
her gauge which is rigidly fixed, and tries each shell at 
one opening and then at another, just as rapidly as she 
can move her hands up and down. It will readily be seen 
that this work requires qualities quite different from those 
required by the girls engaged in the work of inspecting. 
This difference was admirably brought out by the tests. 
The tests showed, in this instance, an entirely different 
set of correlations. The correlations found in both in 
stances are given below.