TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 591 of 775

TM 9--2350--311--10

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FUZE SETTING — CONTINUED

d. Procedure Number 4, M564 and M565 Fuzes — Continued

NOTE

The whole-second fuze setting is always indicated by the position of the “0” on the vernier scale.

Each vertical mark on the lower cap scale (moveable portion of the fuze) represents one whole

second of time. For other than whole-second settings, the “0” on the vernier scale

(non-moveable portion of the fuze) must always be to the right of the whole-second portion of

the desired fuze setting and between the whole-second portion of the desired fuze setting and

the next one whole-second vertical mark. For example, for a setting of 20.5 seconds, the “0” on

the vernier scale is to the right of the 20-second mark and midway between the 20 and

21-second marks on the lower cap scale.

(b) To set the M564 and M565 fuzes for a tenth of a whole second (e.g., 20.5 seconds), use the M34

or M18 fuze setter to set the fuze for the whole seconds on the lower cap scale (6) (in this case the

whole is 20 seconds). Next find the desired tenth of a second mark on the vernier scale (7).

Continue to slightly rotate the lower cap in the direction of the arrow until the adjacent upper right

graduation on the lower cap scale is alined with the desired tenth of a second mark on the vernier

scale. (The 0.5-second mark is now alined with the 30-second mark on the lower cap scale.)

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