Figure 8-12. Elbow telescope ( Self Propelled Howitzer)- assembled view.

TM 9-258

Controls for laying the howitzer on line-of-sight targets

thereby erecting the reticles with the aid of an illuminated

are the same as those utilized for indirect fire, since the

cross-level. The howitzer is then elevated and the target

telescope and mounts are bolted to the howitzer mount.

alined to the proper range mark on the reticle. It is a 4

Correction for cant is achieved by rotating the telescope

power elbow-type instrument with a field of view of 10.

within its mount and

Figure 8-12. Elbow telescope ( Self Propelled Howitzer)- assembled view.

Section IV. PANORAMIC TELESCOPES

raising or lowering of the line of sight to any required

8-10. General.

angle. By the combination of these motions, the line of

a. The panoramic telescope is a type of fire-

sight can be directed on any aiming point.

control instrument employed to aim a gun or howitzer in

c. The different types and models of panoramic

azimuth. It is used in conjunction with a telescope mount

telescopes are of the same basic design. They differ in

to which it is assembled. The telescope mount travels

the components of their optical systems, the angle at

in azimuth with the weapon, carrying the line of sight of

which the eyepiece is mounted with relation to the upright

the telescope: The telescope provides the mechanisms

body of the instrument, the indexing of the scales,

for setting the azimuth angle while other associated

provisions for setting in deflection, method of mounting,

equipment supplies the elevation angle of site (vertical,

reticle patterns, manner of adjustment, lighting, and other

angle.).

details. A number of these differences are determined by

b. The characteristic feature of the panoramic

the characteristics of the materiel with which the

telescope is that it maintains an upright image regardless

instrument is used.

of whether the line of sight is directed forward, to the

d. An objective prism, a rotating Dove prism,

side, or to the rear of the observer (para 4-7d (4) and

and an Amici prism (fig 8-13) comprise the erecting

(5)). The upper or rotating head of the instrument and

the line of sight may be rotated 360ƒ or through any

system of the great majority of panoramic telescopes. A

Pechan erecting prism assembly may be used in place of

desired angle in the horizontal plane without requiring the

the rotating Dove prism.

observer to change his position. The mount provides for

the

8-8