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Example 2:
For this example we will use a measurement of
17° 11' 20". Since the handwheel dial has 2' divi-
sions, one extra step is needed to arrive at the
odd number minute. We will need to add sixty
seconds on the vernier to make one additional
minute on the handwheel dial.
Again, this exercise assumes the table position
starts at 0˚, as read on the edge scale on the edge
of the table, and that the "0" on the handwheel
dial and the vernier scale are aligned. For these
instructions, refer to Figure 21.
1.
As in the previous example on Page 14,
rotate the handwheel clockwise 4 times.
Continue rotating until "1" on the handwheel
dial aligns with "0" on the vernier. You are
now at 17° (see Figure 21A).
2.
Find the 60" vernier mark highlighted in
Figure 21B, and align nearest handwheel
graduation dial mark left of the 60" mark with
60" mark on vernier scale. You are now at
17° 11'. We just added the sixty seconds we
needed to make the odd numbered minute
(from 10' to 11').
3.
Figure 21C highlights the 20" mark on the
vernier. The nearest graduation on the
handwheel dial to the left of the 20" mark
needs to be aligned with the 20" mark on
the vernier. You are now at 17° 11' 20" (see
Figure 21D).
Note: The handwheel should not be rotated
past this point. If it is, rotate it counterclock-
wise one full turn and "sneak" up on the mark
again. Once you are satisfied with the table
position, lock it in place with the table locks.
-16-
60
0
Vernier
A
30
0
60
0
B
30
60
0
C
30
60
0
D
30
Figure 21. More vernier scale adjustments.
Model T25937 (Mfd. Since 3/16)
60
Handwheel
30
60
0
30
60
0
30
60
0
30
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