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.