Figure 8-13. Panoramic telescope (towed Howitzer) - assembled view, optical elements, and optical diagram.

TM 9-258

double-convex eyelens.

A reticle with appropriate

8-11.

Panoramic Telescope (Towed Howitzer).

pattern for the type of materiel used is mounted in the

a. The panoramic telescope illustrated in figure

focal plane of the objective between the Amici prism and

8-13 is typical of those designed for use on a telescope

the eyepiece. The model designation of the telescope

mount primarily to point a gun or howitzer in azimuth for

indicates the reticle pattern. The reticle is illuminated by

indirect fire and may also be used for direct fire. It has a

a lighting system for night use. An open sight on the side

magnification of 4 power and a field of view of 10. An

of the rotating head enables the observer speedily to pick

azimuth scale and micrometer are provided for setting

up the designated target.

deflections. A throwout lever permits rapid traversing

without the use of the azimuth knob. The 900 objective

8-12. Panoramic

Telescope

(Self-Propelled

prism in the head of the telescope may be rotated in

elevation a limited amount, if necessary, to bring the

Howitzer).

aiming point into the field of view.

a. The panoramic telescope illustrated in figure

b. The erecting system is comprised of an

8-14 is the basic instrument used in laying the weapon in

objective prism, rotating Dove prism, and Amici prism

azimuth and is mounted directly on the telescope mount.

(figs 4-11 and 4-22). A plane glass window in the

It is a 4 power, fixed-focus telescope with a 170 mil field

rotating head protects the optical system from dirt, dust,

of view. It is equipped with a mechanical counter device

and other foreign matter; it particularly protects the

and a gunner's aid counter is integral with the instrument.

objective prism from scratches and breakage.

Included also is a reset counter which can be set to show

compound objective is mounted between the rotating

a reading 3,200 mils when the telescope is alined with

prism and the Amici prism. The eyepiece is of the

the aiming stakes and the weapon is parallel to the base

Kellner type with an achromatized doublet field lens and

line. A gunner's aid counter mechanism, which permits

azimuth

8-9