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Chapter 1. DESCRIPTION AND THEORY OF OPERATION
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
TM 9-1240-375-34&P
DIRECT SUPPORT AND GENERAL SUPPORT
EQUIPMENT DESCRIPTION AND DATA
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES
M17/M17A1 and M18/M18A1 Fire Control Quadrants: The dual fire control quadrants are identical
with the following exceptions. The M17/M17A1 quadrant contains a left-hand worm shaft assembly and
gear, and the M18/M18A1 quadrant contains a right-hand worm shaft assembly and gear. Also, the
M18/M18A1 quadrant features a cross level vial, which is not present on the M17/M17A1 quadrant. Both
quadrants have the capability of measuring elevation to 1433 mils. The dual equipment permits either the
assistant gunner or the gunner to lay the cannon in elevation. The counters and level vials are self-
illuminated with radioactive tritium H3 in the M17 and M18 quadrants and illuminated by battery power in
the M17A1 and M18A1 quadrants.
M171/M171A1 Telescope and Quadrant Mount: The M171/M171A1 mount supports the
M137/M137A2/M137A3 telescope and the M17/M17A1 quadrant. The M171/M171A1 mount is installed on
the left trunnion of the howitzer. It provides an adjustable base for leveling the M137/M137A2/M137A3
telescope and the M17/M17A1 quadrant. The adjustable base compensates for azimuth and elevation errors
introduced by cant when the weapon is elevated. The M171 level vials are illuminated by tritium H3 and
the M171A1 level vials are illuminated by battery power.
M172/M172A1 Telescope and Quadrant Mount: The M172/M172A1 mount supports and provides an
adjustable base for leveling and boresighting the M138/M138A1 telescope and the M18/M18A1 quadrant.
The M172/M172A1 mount is installed on the right trunnion of the 155-mm howitzer.
M137 Panoramic Telescope: The M137 telescope is a 4-power, 10-degree field of view instrument with
digital counters. All counters and the reticle of the M137 telescope are self-illuminated by radioactive
isotopes. The M137 telescope is the basic instrument used in laying the M198 howitzer in azimuth. The
M137 telescope is mounted to the upper part of the M171 mount. This instrument is hermetically sealed
and can be purged with dry nitrogen.
M137A2/M137A3 Panoramic Telescope: The M137A2/M137A3 telescope is a 4-power, 10-degree field of
view instrument with digital counters. All counters and the reticle of the M137A2/M137A3 telescope are
self-illuminated by lithium batteries. The M137A2/M137A3 telescope is the basic instrument used in laying
the howitzer in azimuth. The M137A2/M137A3 telescope is mounted to the upper part of the M171/M171A1
mount. This instrument is hermetically sealed and can be purged with dry nitrogen.
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