FIGURE 2-1.CONTROLS AND INSTRUMENTS (SHEET 4 OF 4).

TM5-6675-296-14

(3) To read the scale, whether for the

horizontal or vertical circle, start at the first

NOTE

upright whole number (in the lower portion of the

A fixed verticle line will be observed in the center of

the horizontal or verticle circle (as applicable) and the

double image) to the left of the vertical line. For

micrometer circle scales. This vetical line rnarks the

example, refer to sheet 4 of figure 2-1 and start

middle of the field of view and forms a pointer to aid in

with 319. Count the graduations to the next

the coincidence adjustment. Do not take readings from

numbered graduation to the right of the vertical

this line.

line on the upper portion of the double image. This

(2) The coincidence adjustment is made by

graduation is 639 and it is referred to as

diametrically across from 319. Each graduation

lines of the upper half of the vertical or horizontal

2-5