APPENDIX 
405 
shows test sheet). “Start at the top and go across every 
line, marking every group that contains both ‘ 1 ’ and * 7 
Do this quickly and carefully. All right? Start.” Allow 
120 seconds. 
Record: There are 70 numbers which can be marked. Each 
number skipped or marked wrongly is an error. Record 
number of test, time allowed, numbers checked, errors 
made. E. g., 8; 120 secs., 60 — 3. 
Rating: Apply formula I. The reference point is 70 numbers 
checked in 120 seconds; RU, or reference units, 70; N, 
number of units the subject covers; E, errors, which should 
N - 2E 
count double. Then —=7=— = r, applied to above sample 
RU 
60 — 6 
gives: - - — = -77 
Suggestions: A correction key which can be placed alongside 
the test sheet will materially help the examiner in correct 
ing the test. 
9. Tachistoscope 
Description: The small Harvard type piece was used to test 
inspectors. No correlations whatsoever were found. This 
fact may be attributed in part to the inaccuracy and un 
reliability of this type of apparatus. A portable tachisto 
scope of an entirely different type has been devised and 
is being tried out. It is as yet too early to publish the 
results. 
C. INSPECTION SERIES 
I. Order of Procedure: 
a. Shock absorber, 33. 
b. Eye test, 1. 
c. Cancellation test, 6. 
d. Number group checking test, 8. 
e. Card sorting (simple), 2.