Table 8-1. General Dimensions and Leading Particulars

TM 9-258

axes. Two lines and two spaces, located on the

reticle is coated to prevent light rays from passing

horizontal axis on both sides of the boresight cross

through the disk except at the lines of the reticle

along the horizontal axis, provide a zero elevation and

pattern.

lead reference representing a field 40 mils in width. The

(5) Electrical lighting system. A 24-volt dc electrical

spaces located immediately adjacent to each 1-mil arm

of the boresight cross are 4 mils wide. Each line and

system provides illumination for the reticle and the

space located beyond the 4-mil space represents 5

range scale. A control panel on the back of the range

mils. Elevation and depression reference is provided by

finder provides controls for light intensity of the reticles

a pair of symmetrically placed broken lines of 2 mils

and scales.

below the center of the boresight cross. Each of these

e. Metric System. Since range distances are being

lines consist of a line, a space, and a line of 5 mils

each. A 1-mil space and a 2-mil line arranged above

converted to the metric system of measurement rather

and below the ends of the vertical member of the

than yards, future range finders will measure distance

boresight cross on the vertical axis provide a zero

in meters.

reference in azimuth.

8-23. Tabulated Data. The data listed in table 8-1

(d) Auxiliary boresight (gunlaying) reticle.

includes basic general characteristics of a typical range

finder which are necessary to Army maintenance

The auxiliary boresight (gunlaying) reticle pattern (A, fig

personnel for performing their function.

8-26) is identical to the main boresight (gunlaying)

reticle pattern ((4) (c) above). The reticle disk for this

Table 8-1. General Dimensions and Leading Particulars

Technical data

Value

Length (overall) ....................................................

84 in.

Height (overall).....................................................

12 in.

Depth (overall) .....................................................

14 in.

Weight (including end housing assemblies) ........

149 lb

Base length ..........................................................

79 in.

Range ..................................................................

500 to 4,400 meters

Magnification........................................................

10 power

Field of view .........................................................

Exit pupil ..............................................................

0.120 in.

Diopter scale ........................................................

4.00 diopters

Section VIII. SPECIALIZED MILITARY OPTICAL INSTRUMENTS

convenience of operation but its simplicity, ruggedness,

8-24. Collimator Sight.

and low cost make it particularly desirable as a sighting

a. The collimator sight (fig 8-27) is an ingenious

device for mortars.

and relatively inexpensive type of sighting device. The

collimator is inferior to the telescope in effectiveness or

8-26