APPENDIX 
429 
subject finish. “Now do the same thing with your left 
hand. All right? Start.” Two trials with each hand are 
given. 
Record: Number of test, hand, and time in each trial. 
Suggestions: These tests have since been combined into a 
single board, and another board with still larger cut-outs 
is being designed. No definite standards have yet been 
established. 
When 34 is used as a shock absorber, it need be given 
only once, and only with the right hand. To give it for 
the left hand might embarrass rather than quiet the sub 
ject. These tests have been found valuable in detecting 
at once people who are left handed. It is important not 
to assign left-handed people to machines or benches de 
signed for right-handed use. 
38. Cube Construction (see Ch. XI). 
39. Stenquist Mechanical test (see Chs. VI and XI). 
J. TRADE TESTS 
42. Tool makers’ vocabulary (see Ch. XIII). 
43. Tool makers’ part whole relation test (see Ch. XIII). 
44. Tool makers’ contest test (see Ch. XIII). 
45. Trade questions for gunsmiths (see Ch. XX). 
46. Jig and Fixtures (designing) 
1 Q. What is the difference between a jig and a fixture? A. A 
jig holds the piece and at the same time provides guides 
for the tools. A fixture holds the work, provides no guides 
and must in turn be held securely to the machine on which 
it is used. 
2 Q. What determines the length of a drill bushing? A. The 
bushing generally is twice as long as the diameter of the 
tool used in it.