Readings

62mm Machinegun
KS.

3 (minor reading)

(major reading)

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(major reading)

3 (minor reading)

62mm Machinegun
—50/3 (elevation reading)

The elevating scale plate on the upper elevating screw is graduated in 50-mil increments from MINUS 200 mils to PLUS 200 mils. There is an index line BELOW each number and a PLUS or MINUS sign ABOVE each, with the exception of the "0". The zero reading has NO sign. TO GET THE ELEVATION READING, THE GUNNER LOWERS HIS HEAD UNTIL HIS EYES ARE LEVEL WITH THE TOP OF THE ELEVATING HAND WHEEL. The major reading is the first number above the first visible index line above the elevating handwheel.

The mil scale on the elevating handwheel is graduated into fifty 1-mil increments. The graduation on line with the dial pointer is the minor reading. The minor reading will not be preceded by a plus or minus sign. The entire reading is recorded as 50/3. The minor reading ALWAYS indicates how many mils BELOW the major reading the gun is laid.

An elevation reading is valid only on the mechanism from which it is obtained. Used on another mechanism, even on the same mount and gun, the reading will be inaccurate. The number of threads exposed on the lower elevating screw must remain the same, when both reading and using the data. If the number of threads is increased or decreased after recording the data, fire will not be accurate.

To insure a correct elevation reading to a target, the gunner should fire and adjust on the target. However, the gunner may use the DRY-FIRE method to obtain data on targets without firing and adjusting. In this method, the range to the target is estimated, the range is placed on the rear sight, and the gun is laid on the center base of the target. The direction and elevation readings are then taken. RANGE DETERMINATION is critical in this case because any discrepancy will cause an error in 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 of the gun.

FIELD-EXPEDIENT METHODS OF LAYING THE GUN

Field expedient methods SUPPLEMENT other methods and help in laying the machinegun on predetermined targets in the primary sector. These methods are not as effective as the traversing-bar and travers-ing-and-elevating-rnechanism method, and these methods require additional material. Field expedients serve as the only means of engaging predetermined targets in secondary sectors and aiding the gunner in moving quickly from one target to another in the primary sector during limited visibility. If a crew is replaced for any reason, the field expedients being used must be explained to the relieving crew.

The Aiming-Stake Technique■ The advantage of using an aiming stake in laying a machinegun is that it requires no light at the gun position during limited visibility. It is not effective when visibility is so limited that the aiming stakes cannot be seen. In this technique, the gun is laid to hit a target area, using the following steps:

• The rear-sight slide is raised to its top position in the rear-sight-leaf assembly.

• A strip of luminous tape or luminous paint is placed at least halfway up the rear of the front-sight post»

• A short aiming stake, marked on the top with a strip of luminous tape or paint, is positioned 1 or 2 meters forward of the machinegun position.

• The gunner moves his head slightly to the left, causing the front-sight post to appear in the left corner of the rectangle formed by the rear-sight slide and rear-sight-leaf assembly. Under the gunner's direction, the stake is alined and then driven into the ground, insuring that the two pieces of luminous material are adjacent (alined for direction), and the top edges of both pieces of material are level {alined for elevation). The gunner must maintain the correct position and grip throughout the procedure and, when engaging targets, must cause the front-sight post to appear in the LEFT portion of the rear sight by again moving his head slightly to the left-

The Base-Stake Technique* A base stake is used to define sector limits and may provide the lay for the FPL or other predetermined targets along a primary or secondary sector limit The base-stake method is effective in all conditions of visibility and requires little additional material. The procedures are as follows:

Define sector limits by laying the gun for direct in along one sector limit and by emplacing a stake along the outer edge of the folded bipod legs. The legs rotate slightly on the barrel, so take up the "play." Use the same procedure for placing a stake along the opposite sector limit.

Lay the gun to engage an FPL by moving the muzzle of the gun to a sector limit. Adjust for elevation by driving a stake into the ground so that the top of the stake is under the gas-cylinder extension, allowing a few mils of depression to cover irregularities in the terrain.

Lay the gun to engage other targets within a sector limit, in a primary sector, by using the procedure above, except keep the elevation fixed.

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