Cased Instruments, Continued
Compasses
Protect the compass needle with cork or eraser bits. Periodically check the
(Continued)
leg alignment. Keep the pen clean and free of ink buildup. Wipe the
compass with a light oil cloth and return it to the case. Do not oil the joints.
To check compass alignment, follow this table:
Step
Action
1
Spread legs on compass.
2
Bend joints toward center.
3
Needle and nib should touch.
Figure 2-26 illustrates a test for alignment of the compass legs.
Figure 2-26. —Testing a pivot joint
compass for alignment.
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