The Marine Sextant, Continued
How a Reading
An example of what the scales would look like if there were no index
of 0.0 Index
error is shown in figure 8-16. Notice that the index mark is directly
under the 0 on the arc scale and the 0 mark on the vernier scale lines up
directly with the 0 mark on the micrometer drum.
Figure 8-16. A reading of 0.0 index error.