MIL-T-48558B, MILITARY SPECIFICATION: TELESCOPE, ELBOW - M138A1 (29-MAY-1990) [S/S BY MIL-DTL-48558C]

MIL-T-48558B, MILITARY SPECIFICATION: TELESCOPE, ELBOW - M138A1 (29-MAY-1990) [S/S BY MIL-DTL-48558C]., This specification covers one type of elbow telescope which provides eight power magnification and an eight degree field of view. The telescope has a mil scale reticle for setting elevation. The reticle pattern is radioactively illuminated. (see 6.1).