Figure 2-39.
Vises
2-8. Leveling Tools.
a. Common Level. The common level (Figure 240) is used for both
guiding and testing when bringing work to a horizontal or vertical
position. The level has a long rectangular body of wood or metal,
which has a builtin glass spirit tube on its side and near the end.
Each tube contains a nonfreezing liquid with a small air bubble free
to move within the tube. The side and end tubes are at right angles
to each other. When you center the bubble of the side tube with the
hairline, the level is horizontal; when you center the bubble of the
end tube with the hairline, the level is vertical. By holding the
level against a surface to be checked, you can determine whether the
surface is truly level (or plumb). Levels should be hung up when not
in use.
Figure 2-40.
Common level
EN5155
2-20
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