Download FM6-751945 (1) PDF

TitleFM6-751945 (1)
LanguageEnglish
File Size3.7 MB
Total Pages103
Document Text Contents
Page 1

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SERVICE OF THE PIECE

105-MM HOWITZER M2 |
'•:r;

TRUCK-DRAWN i-o
and TRACTOR-DRAWN -

WAR DEPARTMENT • OCTOBER 1945

UNCLASSIFIED

Page 2

WAR DEPARTMENT FIELD MANUAL

F M 6-75

This manual supersedes FM 6-75, 12 December 1941, including C 1,
23 May 1942; C 2 29 June 1943; C 3, 3 September 1943; C 4, 15 Oc
tober 1943; and C 5, 25 October 1944.

SERVICE OF THE PIECE

105-MM HOWITZER M2

TRUCK-DRAWN

and TRACTOR-DRAWN

WAR DEPARTMENT OCTOBER 1945

DISSEMINATION OF RESTRICTED MATTER.

No person is entitled solely by virtue of his grade or position to knowledge
or possession of classified matten Such matter is entrusted only to those
individuals whose official duties require such knowledge or possession,

(See also paragraph 23b, AR 380-5, IS March 1944.)

United States Government Printing Office

Washington : 1945

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/. Designation of target. The command is: TAR
GET (SO-AND-SO).

2. Projectile, charge, and fuze. The commands spec
ify the appropriate items in sequence, such as
SHELL HE, CHARGE 6, FUZE DELAY; OR SHELL ANTI
TANK. Shell HE-AT will be used against tanks
except where bracketing methods of adjustment
are employed. When shell HE-AT is not avail
able or when bracketing methods are employed,
shell HE is used. With shell HE-AT, no com
mand for charge or fuze is necessary. When fir
ing shell HE against close-in targets, use charge
6 since the trajectory with this charge approx
imates that for HE-AT. Against distance targets
or stationary targets where bracketing methods
are used, charge 7 may be fired. Fuze delay
should be used against tanks, armored vehicles,
fortifications, or personnel. If less than 50 per
cent of the rounds fired against personnel during
adjustment are ricochet bursts, the fuze setting
should be changed to superquick. Concrete
piercing fuze with HE shell should be used,
whenever available, against concrete pillboxes or
fortifications.

3. Lead. The command is: LEAD (SO MUCH).
4. Method of fire. Usually the command is: CON

TINUOUS FIRE, the piece being loaded and laid
as rapidly as possible and fired at the command of
the gunner.

5. Range. The command is: RANGE (SO MUCH).
Note. Commands in 2 and 4 above may be omitted when the state

o£ training of the howitzer squad or standing operating procedure permit.

(/) To determine subsequent data. See paragraph 33.
(g) To announce a change in lead and range. During ad

justment, changes in lead to be applied to the lead being used
are commanded as RIGHT (LEFT) (so MUCH). Range is in
creased by the command ADD (so MUCH) and decreased by the
command DROP (so MUCH).

b. Gunner, (i) Enumeration of duties, (a) To center
the cross level bubble on the panoramic telescope mount.

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(£) To set the elevation index and micrometer of the
panoramic telescope at zero.

(c) To set the azimuth scale and micrometer of the pano
ramic telescope at zero.

(d) To track the target.
(e) To command FIRE.
(/) To re-lay on the target immediately after the piece has

fired.
(g) To repeat his actions in accordance with the fire com

mands and subsequent changes thereto.
(2) Detailed description of certain duties, (#) To lay on

the target with announced lead and trac\ the target. The
gunner sets his azimuth scales at zero and tracks the target
with the traversing handwheel, using the center of the
visible mass as an aiming point and keeping the vertical
hair of the telescope ahead of the target by measuring the
announced lead on the reticle scale (fig. 19). When time
does not permit the chief of section to announce the lead, it
is determined by the gunner.

(£) To give command to fire. He gives the command
FIRE, when ready, after No. I has called "Set."

C. No. 1. (i) Enumeration of duties, (a) To lay for
range, using the elbow telescope.

(£) To track the target.
(<r) To call "Set" when the piece is loaded and the cor

rect range line is on the center of the visible mass of the
target.

(d) To re-lay on the target immediately after the piece
has fired.

(e) To repeat his actions in accordance with the fire com
mands and subsequent changes thereto.

(2) Detailed description of certain duties. To lay for
range, using elbow telescope. In direct laying, when so
directed, No. I lays for range (with the correct angle of site
automatically applied) by using the appropriate range line
in the reticle of the elbow telescope. No. i, using the elevat
ing handwheel, keeps the range line corresponding to the
announced range on the center of the visible mass of the
target (fig. 20).

47

Page 102

Paragraph Page
Lead, to determine................................... 31 45
Loading the piece.................................... 23 39

Maintenance and care of materiel...................... 48-54 64
March order......................................... 18 23
Materiel:

Care and maintenance............................ 48-54 64
Destruction..................................... 58-63 90-
Functioning..................................... 20 29

Measuring:
Angle of site to mask............................ 20 29
Deflection. ....................,.............:'... 21 33
Elevation....................................... 20 29

Misfires............................................. 42 51
Mounting........................................... 10 8
Movement of piece by hand .......................... 12, 13 12

Optical parts:
Care............................................ 45 58
Destruction..................................... 59 91

Panoramic telescope. (See Telescope, panoramic.)
Posts, aiming:

Alignment...................................... 35 53
Correction for displacement....................... 36 54

Posting cannoneers................................... 9 6
Posts of cannoneers:

Pieces coupled................................... 8 6
Pieces uncoupled................................. 8,17 6,20
Prepared for action............................... 17 20

Powder charges:
Destruction..................................... 62 93
Replacing increments in rounds not fired........... 26 41
To prepare...................................... 26-28 41

Prearranged fires..................................... 20 29
Prepare for action.................................... 16 16

Quadrant, gunner's:
Test. ........................................... 47 59
Use............................................. 20 29
Quadrant, range................................. 47 59

Rammer, method of using............ ............. 22, 41 37,56
Range:

'Determining initial.............................. 31 45
Laying for.'..................................... 31 45
Setting.......................................... 22 37

Range card......................................... 30, 31 44,45
Range limits in direct laying.......................... 33 51
Range quadrant...................................... 47 59
Recording base deflection............................. 21 33

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Page 103

Paragraph Page
Recording basic data................................. 20 29
References........................................... 2 1
Refer the piece....................................... 21 33
Reporting errors..................................... 20, 37 29, 55

Scales, azimuth...................................... 47 59
Section, howitzer:

Duties. (_Sci Duties.)
Composition.................................... 3, 4 3,4
Formation...................................... 5 4
Mounting, dismounting. ......................... 10, 11 8, 11
Section data board................................ 44 54

Section maintenance drill............................. 48-54 64
Sighting equipment:

Boresighting......... .......................... 47 59
Care.................. ......................... 45 58
Destruction..................................... 59 91
Tests and adjustments............................ 47 59

Site, angle of:
Scales........................................... 47 59
Setting.. ........................................ 22 37
To mask........................................ 20 29

Squad, howitzer..................................... 4 4
Formation...................................... 5 4
Posts........................................... 6, 7 6

Suspending fire.........................'............. 39 55

Telescope, elbow:
Tests and adjustments............................ 47 59
Use............................................. 31 45

Telescope, panoramic, M12:
Care. ........................................... 45 58
Destruction..................................... 59 91
Mount.......................................... 47 59
Tests and adjustments............................ 47 59
Use............................................. 21 33

Testing target.................................. r.... 47 59
Tests, sighting and laying equipment.................. 47 59
Tracking target...................................... 31 45
Tractor M5, medium. (_Sec Materiel.)
Trailer M21. (Sec Materiel.)
Trails, shifting............................... 23, 24, 27, 28 39,40,

42,43
Tube, destruction.................................... 60 91

Uncoupling.....................................;... 14 13
Unloading the piece................................ 22, 41 37, 56

Vertical displacement............................... 33 51

98

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