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mirror reflects the beam on a translucent dial which is fixed on an adjustable base mounted directly on the plane so that the beam shows whether the machine is flying level, climbing or drooping a wing. It should show whether the machine is turning and possibly it does, but centrifugal force may commence to act on the gyro and the usual precession take place which may or may not interfere with the accuracy of the reading. The instrument will allow the pilot to climb the ship at the best possible climbing angle and glide at the flattest glide. In its present interpretation, the instrument is not very remarkable except for being a different application of old and well established principles. They might be infused into one instrument which in fact could be made a turn indicator, flight indicator, inclinometer, gradometer, air speed meter and a device to show best glide and climb.

The navigator is also provided with a turn indicator or derivimeter S. T. Aǿ., and bomb sight in one. It is the old principle of a hole in the floor provided with a series of adjustable parallel lines in such a way to allow objects to move along these lines and then read the angle. By means of a sight graduated for altitude, it is possible to read the ground speed by applying the time coefficient to the graphic chart provided. Windows in the

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Transcription Notes:
Didn't know the symbol after the A.