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indicating dials. The lever controls of the carburetor should bear a special notch necessitating a movement for being freed and provided with a stop corresponding to full limited throttle admissible at sealevel. The altitude at which total admission is admissible should be printed upon the instrument board. The carburetor controls should, so far as is possible, by synchronized so their successive positions indicate the progressiveness of the number of revolutions of the motor.
 
IGNITION - The wires should be well insulated and terminated by unhookable clasps. No metallic parts should be found less than 1 cm. from the ends of the longest spark plugs used.
   A separate switch should permit the stopping of each motor and a motor switch should permit the stopping of the whole group of motors.

MANIFOLDS - The manifolds should be as short as possible, with streamlined shapes, constructed with the minimum number of elbows, and arranged with supports and flexible connections to obviate breakages under the influence of vibrations. They ought to be easily accessible throughout their whole length.
   Account should be taken of the load and the resistances in the dimensions of the pipes which should permit a load higher

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