Section 2. DESCRIPTION AND DATA
The M19 and M24 Periscopes are used to see at night. The vehicle has infrared head lamps that light the
area in front with invisible infrared rays. The rays bounce off objects in the area and return to the
periscope. The periscope changes the infrared rays to visible light, so that the dark area covered by the
infrared head lamps can be seen. The periscope is focused at about 18 meters in front of the vehicle. The
periscopes are made up of two main parts:
a. The HEAD ASSEMBLY holds the prism that directs the infrared rays down into the body
assembly. The head assembly projects up through the vehicle armor,
b. The BODY ASSEMBLY converts infrared rays to visible light. The body assembly has two image
converter tubes that change the infrared rays to visible light that can be seen by looking in the two
EYEPIECES on the rear of the body assembly. On the M19 and M24 old configurations, the body
assembly has a left and right focus control. The TRUNNION supports the body assembly in the vehicle.
The LOCKING ASSEMBLY lets you move the periscope to get a better view. The HEADREST
ASSEMBLY can be moved to change the distance from your eyes to the eyepieces.