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Using a Pelorus

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Using a Pelorus.jpg A Tramp SteamerThumbnailsAn Airplane View of the U. S. S. LangleyA Tramp SteamerThumbnailsAn Airplane View of the U. S. S. LangleyA Tramp SteamerThumbnailsAn Airplane View of the U. S. S. LangleyA Tramp SteamerThumbnailsAn Airplane View of the U. S. S. LangleyA Tramp SteamerThumbnailsAn Airplane View of the U. S. S. Langley

This apparatus consists of a movable plate marked with compass bearings, set in a stand. The observer sets the plate to correspond to the standard compass, and then sights across it in determining the compass bearings of points ashore from which he wishes to learn his exact position.