Figure 8-20. Periscope ( Infrared)

TM 9-258

c. Means for making azimuth boresighting

8-17.

Periscope (Infrared).

adjustment is provided by azimuth adjustment pin at the

a. The periscope illustrated in figure 8-20 is an

mounting flange of the sight. Elevation adjustment is

infrared viewing device of the binocular type used in night

provided at the connecting arm to which the sight link

driving of vehicles. Invisible infrared rays are projected

assembly connects. A rubber eyeshield, mounted over

forward from headlamps at the bow of the vehicle to

the periscope's eyepiece, serves to protect the eyelens

"illuminate" the field of view. The periscope converts the

and prevent injury to the machinegunner.

infrared image to a visible image which is viewed through

conventional eyelenses. For best vision at average

speeds the range of the periscope is focused at 18

yards.

Figure 8-20. Periscope ( Infrared) - assembled view.

b. This periscope has a magnification of 1

power, a field of view of 26.8 and a focal point of

18 to 20 yards.

8-15