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Flashcards in M2 Aiming Circle Deck (24)
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0

What is the purpose of the M2 aiming circle?

Measures angular values with respect to preselected baseline

1

Accuracy of Aiming circle?

0-1 mil

2

What controls the elevation and depression movement?

The elevation micrometer

3

What controls azimuth measurement on aiming circle?

Azimuth micrometer knob

4

What allows rapid azimuth measurement on aiming circle?

Azimuth micrometer worm

5

Describe telescope on aiming circle?

4x
fixed focus
elbow type

6

What distance should you be from high-tension power lines and electronic equipment when using aiming circle?

150 m

7

Distance from railroad tracks and tanks/trucks when using aiming circle?

75 m

8

Distance from vehicles when using aiming circle?

50 m

9

Distance from barbed wire when using aiming circle?

30 m

10

Distance from mortars/telegraph wire when using aiming circle?

25 m

11

What is the dec constant for Ft Bragg?

6250 mils

12

Define declination constant

Clockwise angle between grid N and magnetic N

13

Purpose of declination stations

To determine dec constants of instruments and to correct for local attractions, annual variations, and instrument errors.

14

What are the criteria for choosing a site for a declination station?

Must have a view of at least 2 well defined points with a known grid azimuth

15

What are the 4 rules for when the aiming circle should be declinated?

1. When it is moved 25 miles or more from the area in which it was last declinated
2. After an electrical storm or severe shock
3. Every 30 days
4. When it is first received or returned from support maintenance repair

16

Weight of M2/M2A2 aiming circles without equipment?

9 lbs

17

Weight of M2/M2A2 with equipment?

21 lbs

18

Azimuth rotation of both aiming circle models?

6400 mils

19

Max elevation of M2 aiming circle?

800 mils

20

Max elevation of M2A2 aiming circle?

1100 mils

21

Max depression of both aiming circle models?

400 mils

22

Magnification of both aiming circle models?

4 x

23

Field of view of both aiming circle models?

10 degrees