Description.
The panoramic sight is a vertical telescope so fitted with an optical system of reflecting prisms and lenses that the gunner can bring into his field any point in a plane perpendicular to the axis of the telescope. The optical characteristics of the instruments are as follows:
Power = 4.
Field of view = 10°.
The rotating head prism has a movement of 600 mils in a vertical plane; movement is obtained by turning elevation micrometer. The amount and direction of rotation is indicated on a scale in the head by the elevation index and micrometer. The scale is graduated in 100-mil intervals, the micrometer in mils. One complete turn of the micrometer is equivalent to one space on the sale. The head is level when the index is opposite 3 and micrometer at zero.
PANORAMIC SIGHT MODEL OF 1917
Movement in azimuth is obtained by turning azimuth worm. The amount of rotation is read from the scale on the azimuth circle and the azimuth micrometer. The azimuth micrometer may be turned independently of the azimuth worm to set any desired deflection. Figures in black are for right-hand deflection and in red for left-hand deflection. The scale on the azimuth circle is graduated in 100-mil divisions from 0 to 32 in each half circle. The micrometer is graduated for every mil. For larger angular deflections, by turning the throw-out lever the azimuth worm is disengaged, permitting the head to be turned to any desired position.
The reticule is provided with a horizontal and a vertical cross line. The horizontal line is graduated in mils.
An open sight attached to the side of the rotating head is for approximate setting of the instrument.
No disassembling or adjustment of the panoramic sight, except as described herein, is to be made, except by ordnance personnel detailed for such work.
The panoramic sight is seated in a T slot in a socket of the sight, model of 1916, in firing, and is carried in a panoramic sight case on the shield when traveling.
Use of the Panoramic Sight for Direct Fire.
Level rocker with zero on range scale opposite 300 on angle-of-site scale and gun at center of traverse. Set azimuth scale at zero, azimuth micrometer knob at zero, micrometer index at zero, elevation scale at 3, and elevation micrometer knob at zero. By means of cross-leveling knob on sight socket bring cross-level bubble level.
Correct for deflection in azimuth by turning azimuth micrometer until required deflection is opposite fixed arrow pointer; bring zero on micrometer index to zero on azimuth micrometer by means of micrometer-index knob.
Elevate gun by means of angle-of-site handwheel and traverse until cross hairs of panoramic sight are on target.
For Indirect Fire.
Level rocker and set scales for zero setting as directed in first paragraph under “direct fire.”
Lay off required deflection in azimuth by means of micrometer index and azimuth worm knob, so that deflection may be read from azimuth index and azimuth micrometer. Traverse gun until vertical cross hair of panoramic sight is on aiming point.
Vertical angles may be read by means of elevation scale and micrometer scale. Zero point of elevation scale is 3. Each division on elevation scale represents 100 mils.
All scales are graduated in mils.
The open sight on side of rotating head is used to obtain preliminary direction of sight.
In turning azimuth angles greater than 100 mils the throw-out lever may be pressed and rotating head turned to nearest division in even hundreds desired. Each unit on azimuth scale represents 100 mils.
Panoramic Sight, Model of 1915.
The panoramic sight is a vertical telescope so fitted with an optical system of reflecting prisms and lenses that the gunner with his eye at the fixed eyepiece in a horizontal position can bring into the field of view an object situated at any point in a plane perpendicular to the axis of the telescope.
The rays coming from the object are reflected downward from the rotating head prism into the rotating prism. The rotating prism rectifies the rays; after their passage through the achromatic objective lens, the lower reflecting prism reflects them in such a way that there is presented to the eyepiece a rectified image, which the eyepiece magnifies. A glass reticule marked with graduated cross lines is located in the focal plane of the instrument, with the intersection of the cross lines coincident.
The instrument has a universal focus, a magnifying power of 4 and field of view of 180 mils.
PANORAMIC SIGHT MODEL OF 1915
The principal parts of the panoramic sight are the rotating head, the elevation device and its micrometer, the azimuth mechanism with limb and micrometer, the rotating prism mechanism, the deflection mechanism, R and L scale and micrometer, the shank and the eyepiece.
The limb or azimuth scale is divided into 64 parts, each division representing 100 mils.
The azimuth micrometer is divided in 100 equal divisions or mils, numbered every 5 mils. One complete revolution of the azimuth micrometer is equal to the distance between divisions on the azimuth scale. The limb of the deflection scale is divided into six divisions; three on each side of the zero, red for right and black for left, each division representing 100 mils. The deflection micrometer, engraved upon the front end, is graduated into 100 equal divisions, numbered every 10 mils, red and black in opposite directions.