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at all times. The compass is illuminated in the usual way. The compass is so equipped with a prism and a light that the navigator sees his sighting point and the compass reading at the same time. The compass is mounted on a slide so as to allow it to be lowered and pulled within the adjustable top of the compartment.

Another interesting instrument is mounted in the pilot's cockpit but was not seen in the machines at the factory. It is merely an adaptation of the disk system of communication between navigator and pilot. Two disks which are identical are provided with hands which can be moved by either pilot or navigator and about twenty-five form messages can be sent. A wire runs over two small pulleys which are fixed to the hands and actuates them. The installation is very good but it could be improved by the addition of enough spaces to allow words to be spelled out. The instruments could be provided with a tape to record automatically the message sent. This presents no difficulty and would be a good auxiliary means of communication. The real way to communicate between pilot and navigator is by word of mouth.

A slightly different type of flight indicator and inclinometer is also provided. It consists of the usual gyro mounted vertically and provided with a small mirror mounted on top. A source of light beam is provided by a small electric bulb. The

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