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  subject. ­
  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  designed ­
  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.