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  correcting ­
  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  unreliability ­
  of  this  type  of  apparatus.  A  portable  tachistoscope ­
  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.