Cased Instruments, Continued
Protect the compass needle with cork or eraser bits. Periodically check the
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:
Spread legs on compass.
Bend joints toward center.
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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