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the fuselage to the rear should be reduced to the minimum.

The tourelles should be placed so as to interfere as little as possible with the communication between the pilot and the observer. At the aide of the pilot, it should not be possible to pass the gun in the low position, but for all other sectors, the rotation of the tourelle should permit every possible position of the guns.

The diameter of the base ring of the tourelle is 800 millimeters.

The diameter of the axis or yoke bearing the guns is 920 millimeters. Accordingly, a free space of at least 950 millimeters diameter around the transverse ring is necessary for the passage of the supporting shaft of the guns in the low position.

Vertical firing under the airplane will only be possible for a fuselage having less than 920 millimeters width.

Stops or devices should be provided to prevent the guns from firing into the field of the propeller.

Field limiters are provided for the tourelles in the cases where guns could touch the propellers (R. II C. 25, etc.)

The tourelle ring should be perpendicular to the plane of vertical symmetry of the fuselage and parallel to the line of flight.

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