FIG. 62
ONE-LEGGED TABLE
AND LEVEL
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he can see you. He will beg to be allowed to try, and finally
you let him, with the same laughable results.
Repeat with other friends.
Experiment 44. To make an engineer's level.
You can make one form of engineer's level
(Fig. 61) as follows: Take a full length of No. 6
tubing, bend it up 4 inches at each end, smooth the ends, attach it
to a small board, rest the board on a one-legged table, and you have a
serviceable level (Fig. 62).
Fill the tube with water, shove the pointed
end of the leg into the ground and sight along the outside of the
upright tubes at the level of the water surfaces. The line along
which you sight is exactly horizontal, because the water surfaces
are at exactly the same level.
Experiment 45. To use the engineer's level.
FIG. 63
HOMEMADE LEVEL IN USE
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An engineer's level is used to find the
difference in level of two or more points (Fig 63).
To practice using your level, find the
difference in level of two points 100 feet apart on a road,
sidewalk, or railroad.
To do this, you
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