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hand lights, green. To keep a straight course, the pilot keeps the two white lights constant.
The instrument is very sensitive and accurate and has an adjustment for steadying in rough weather. Controls are fitted for putting the instrument completely out of action when not re-quired, and also adjusting the brilliancy of the lamps.
The face of the indicator is hinged and can be opened easily in the air for inspection or replacing bulbs in case of failure. Spare bulbs are carried inside the instrument.
Approximately fifty sets of these instruments are now being constructed for the H. A. F. and will be given service tests in Mesopotamia in the near future.

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