MIL-I-18804B, MILITARY SPECIFICATION: INDICATOR, VERTICAL SPEED, 0-6000 FPM, 2-INCH (22-JUN-1964)

MIL-I-18804B, MILITARY SPECIFICATION: INDICATOR, VERTICAL SPEED, 0-6000 FPM, 2-INCH (22-JUN-1964)., This specification covers design and all performance requirements for the 2-inch nominal size vertical speed indicator with a range of 0-6000 feet per minute ascent and descent