Tag: telescope

Model 93, 8 x 6° 15′

This telescope is so constructed that the tubes can be used only in the vertical position. Its primary use is believed to be for observation and correction of artillery fire.

The eyepieces are of the multiple thread focusing type, and the diopter scale is graduated from +2 to -3. The reticle design consists of a vertical and horizontal mil scale graduated in increments of one mil from 0 to 30 on each side of 0. A light receptacle for artificial illumination of the reticle is provided.

The telescope is fitted with an angle of site mechanism. The hinge mechanism of the assembly consists of a simple hinge pin and a fitted yoke. The interpupillary mechanism is locked near the base and between the two tubes.

 
Telescope with Integral Tripod

The general purpose of this instrument is believed to be the observation and correction of fire, used with either machine guns or artillery. Unlike the instrument above, it employs a scissor movement and may, therefore, be used in either a vertical or horizontal position.

The reticle is the only angle measuring device provided. The limit for horizontal angles is 30 mils to the right and 10 mils to the left of zero. Vertical angles of plus and minus 20 mils can be measured. The 90° prisms are cemented. Minimum and maximum interpupillary distances are 60 mm and 70 mm.

The tripod is simply constructed, light in weight, and sturdy. It comprises an adapter or bracket for the telescope, a tripod head, and three tubular, fixed length legs with small metal shoes.

SPECIFICATIONS

		Model 93		Tel. with Int. Tripod
Power		8 diameters		8 diameters
Field of view		6° 15′		6°
Interobjective distance		3 3/4 ins.
Interpupillary setting		58 to 70 mm		54 to 70 mm
Deviation of light in vertical plane		10 ins.		9 ins.
Diameter of Exit Pupil		.2 ins.		.15 ins.
Overall length		12 3/4 ins.		12 ins.
Overall width		6 1/4 ins.
Weight		6 lbs., 5 ozs.		2 lbs., 2 ozs.
Length of tripod				11 13/16 ins.
Weight of tripod				11 ozs.

*The interobjective distance with the tubes horizontal, and the interpupillary scale set at 64 mm is 21 ins.; with the tubes vertical, and the interpupillary scale set at 64 mm, the interobjective distance is 5 ins.

Japanese: p. 178 (March 1, 1945)

The Japanese multiple power observation telescope has three powers: 33X, 24X, and a third degree of magnification which has not been determined because of the absence of a third eyepiece in the instrument examined. Selection is made by rotating a dome-shaped holder in which the three eyepieces are mounted. This is somewhat similar to the turret head employed in motion picture cameras and to the selective eyepiece head of compound microscopes.

The objective is a compound lens with an air space between the crown and flint components. A modified porro prism is used for the erecting system. The reticle design used with the 24 power eyepiece is a simple cross. The 33 power eyepiece is not equipped with a reticle. No provision is made for an instrument light. An open line sight is provided for quick location of an object in the field of view.

The support which is made largely of machined brass castings has an upper and lower movement. The azimuth scale is graduated from 0 to 360 degrees in 1/2 degree steps; a vernier indicator allows readings of one minute to be made. Leveling is accomplished by adjusting the length of the tripod legs. The elevation arc is graduated in increments of 1/2 degrees to + and -30 degrees from 0. The tripod is of wood with brass fittings.

SPECIFICATIONS

Length of telescopes		24 ins.
Weight of telescopes		12 lbs., 8 ozs.
Height of support		11 1/2 ins.
Distance between trunnions		5 1/4 ins.
Weight of support		13 lbs., 4 ozs.
Length of tripod		38 1/4 ins.
Length of tripod (legs extended)		55 1/2 ins.
Weight of telescope		8 lbs., 8 ozs.

Japanese: p. 177 (March 1, 1945)