Traversing Hahpwmcel

UPPER ILlVATIMG SCRtWVOKE

UPPER ILlVATIMG SCRtWVOKE

TRAVifHMG SLIDC LOCK LCVfJI

TRAVERSING lA(t WITH SCALI (3 MILS BETWKtN SMALL LINKS)

Figure ltf. Traversing &<jr and traversing and elevating tneahaniem.

<b) If one limit of the sector is a final protective line, anothe stake should be driven into the ground beside the sector stake, in such a manner that it touches the bottom of the barrel when the gun is laid on the final protective line. This establishes both direction and elevation.

Note, Thin expedient ntmy be employed as a primary meant in the primary sector until such time as conditions of visibility permit recording data from the traversing bar and travertin £ and elevating mechanism.

(c) To engage targets in the secondary sector of fire using this technique, the gunner releases the traversing and elevating mechanism, using the pintle as a pivot.

TRAVERSING lA(t WITH SCALI (3 MILS BETWKtN SMALL LINKS)

TRAVifHMG SLIDC LOCK LCVfJI

Figure ltf. Traversing &<jr and traversing and elevating tneahaniem.

b. Field Expedient Methods. The field expedient method serves to supplement employment of the machinegun in engaging preselected target areas. This method is not as effective as the traversing bar and traversing and elevating mechanism method and requires additional material. Field exipedients are a primary means of engaging preselected target areas in a secondary sector during periods of limited visibility.

(1) Stake method, (a) Lay the gun on the limit of the sector and drive a stake into the ground next to the barrel. This method can be used to establish direction for one or both limits of the aectoT.

<b) If one limit of the sector is a final protective line, anothe stake should be driven into the ground beside the sector stake, in such a manner that it touches the bottom of the barrel when the gun is laid on the final protective line. This establishes both direction and elevation.

Note, Thin expedient ntmy be employed as a primary meant in the primary sector until such time as conditions of visibility permit recording data from the traversing bar and travertin £ and elevating mechanism.

(c) To engage targets in the secondary sector of fire using this technique, the gunner releases the traversing and elevating mechanism, using the pintle as a pivot.

AOO UfiLA

(2) The horizontal log or board method. (a) This technique is used to mark sector limits and provide a sector of graze. The horizontal log or board technique is effective in all conditions of visibility. This technique can be used effectively if the sector of fire is no wider than 800 mils.

( 6 ) Place a log or board beneath the barrel of the gun. The log or board should be positioned in such a way that the barrel, when resting on the log, will be at the proper elevation to obtain a sector of graze. The limits are marked when appropriate. (Sector of fire less than 800 mils wide.)

(c) Dry-fire method. Data to targets may be obtained without firing and adjusting. This is accomplished using the dry'fire method of laying the gun. In using this method, the range to the target is determined by eye; this range is placed on the rear sight and the gun is laid on the ceilter base of the target. The direction and elevation readings are then taken. Range determination is critical because any discrepancy will cause *n error in the elevation when the target is engaged. The dry-fire method of obtaining data is used only when firing is not possible or when the situation is such that firing would disclose the position.

Section IV. RANGE CARDS

106. General a. A range card is a record of firing data necessary to engage preselected target areas within the sectors of fire during periods of limited visibility. The range card may also be used as a reference to engage targets during periods of good visibility, and to aid the leaders in preparing the supporting fire plans.

b. Data for areas within the primary sector are of first concern. The tripod mounted gun is employed to cover the primary sector of fire. Preselected targets in the secondary sector are engaged during periods of limited visibility by the use of field expedients (para 106b).

c. A range card contains two parts; a sketch of the sectors of fire containing drawings of targets, and a data section which lists data necessary to engage these targets during periods of limited visibility. The sketch section is not drawn to scale, but the data referring to the areas is accurate.

107. Preparation of a Range Card

Range cards are prepared in duplicate; one copy stays at the gun position, the other copy is sent to the next higher headquarters. Complete range cards are prepared for primary gun positions, and partially completed range cards are prepared for alternate and supplementary gun positions. The gunner, assisted by other crew members and the leader, is responsible for the preparation of the range card. Range cards are prepared immediately upon arrival in a position regardless of the anticipated length of stay. The range cards will be constantly revised during occupation of a position. Military symbols are used in preparing range card (fig 144). The following are steps in preparing a range card. They need not be accomplished in the order outlined:

a. Position the traversing mechanism (para 106a).

b. Position the weapon with the muzzle oriented on the final protective line. If a final protective line is not assigned, the muzzle should be oriented on the center of sector. Emplace the tripod as explained in paragraph 105a(l) (6).

c. Sketch in the basic symbol for the machine-gun in the lower center portion of the card, oriented in the direction of the final protective line or center of sector, as appropriate (fig 146).

d. If a final protective line is assigned, draw in the final protective line using the procedure outlined In k below.

e. Draw in the limits of the primary sector which does not contain a final protective line on the sketch. No data is recorded in the data section for the limits of sector unless a target is located along this line (fig 146).

/. Draw in the limit of the secondary sector which does not border the primary sector on the range card sketch.

g. Draw in and label friendly positions which are located forward of the forward edge of the battle area (FEBA) and In the vicinity of ma-chlnegun's sector of fire (fig 146).

h. Draw a magnetic north arrow from the base of the machinegun symbol pointing in the direction of magnetic north on the sketch.

i. Orient the gun position with a prominent terrain feature recognizable on a map by obtaining the magnetic azimuth from the terrain feature to the gun position. Determine the distance in meters between these two points (fig 145). Place arrow barbs along this line to indicate the direction in which the magnetic azimuth was taken. If a prominent terrain feature is not available, the gun position may be oriented by using an &-digit grid coordinate.

;'. As marginal data, record the gun number, unit designation, and date in one corner of the sketch. No higher unit designation than company

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