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Rules for Operating and Dismounting the Pratt & Whitney Improved Gardner Gun, As arranged by Captain John E. Greer, Ordnance Department, U.S.A.
To Operate the Gun:
1. Insert the feed-guide in the opening in the casing cover, pressing it down until the catch springs into place.
2. Turn the safety-crank upward and to the rear until the crank-stop drops into the recess in the casing marked "Fire!"
3. Remove the cover of one of the feed-cases, and with the left hand insert the heads of the cartridges into the grooves of the feed-guide; bear downward on the feed-case, steadying the guide with the right hand, and when all the cartridges are in the guide pull the case away from the cartridges. Repeat the operation until the feed-guide is full before commencing the firing, and see that it is kept full during the firing, which may then be made continuous. Turn the crank. If it be turned before the feeding of cartridges is commenced, the first few will fall irregularly, and might check the working of the gun.
4. To point the gun: -- Unclamp the mount body, and by means of the cross-handle clamp-screw, which serves the double purpose of pointing lever and clamp-screw, turn the gun in the direction required; reclamp mount body. For exactness, use the elevating screw attachment.
5. To oscillate the gun without changing elevation:--Loosen by turning to the left with the left-hand, the cross-handle screw which binds the eccentric clamp, and without removing the hand carry the eccentric in either direction right or left; the amplitude of the oscillation may be governed by the operator or it may be limited by the eccentric stop. The device is to be used for laying the gun for side adjustment with accuracy, and when the required point is found, both eccentric and elevating spoke-wheel can be secured by turning the cross-handle screw to the right.
6. When the firing is discontinued, turn the safety-crank downward and to the front until the crank-stop drops into the "safety" recess.
N.B. This gun may be fired by turning the crank backward.