APPENDIX 
433 
ing to drill a tapped hole, namely, the size and the 
size. If a tap is broken off in the hole it can be removed by 
means of a Frequently the tap helps to prevent 
breakage. The pilot of a counterbore should be 
To allow for adjustment when fitting bearings are 
sometimes inserted. All bearings must be made so as to permit 
If a babbitt bearing it will thus pre 
venting injury to the shaft. 
It is a good plan to pieces of machinery so that they 
will go back in the same position if taken down for some pur 
pose. A good way to such pieces is by means of 
A is put on planners and shapers to prevent wear of 
the tool on the return stroke. 
A worn gear should generally run in....... 
A drive pulley to a follower gives a fast speed to 
the follower. 
A pulley may be fastened to the shaft by means of a 
or a 
When filing on a lathe the work should revolve The 
file should be fitted with a 
A good cut for a file which is used for finishing work would 
be 
When knocking a cutter out of a collet it is best to use a 
in the tang hole. 
51. Spatial Perception 
Description: See Chapters IV, VI, XI. This test has been 
enlarged (1) by the addition of new spaces (2) by using 
two form-boards instead of one. The use of two boards, 
each with a different arrangement, makes it possible to give 
the same test in two ways, but it also makes it possible 
to have the pieces arranged in exactly the same position 
for every subject (Ch. XI). 
Instructions: These instructions are intended for the original 
test “Pick up each piece, size it up, and then put it