Patent:GB125457

"Plane-trigonometry calculators.-Relates to apparatus for calculating the height of aircraft or other objects from the observations of a longhome-base range-finder of the type in which at each station a plane is (in effect) rotated about a horizontal axis perpendicular to the base line until it passes through the object, and the angles between the base and the planes thus inclined are observed...."

• DATUM: 24.04.1919
• TITEL: Improvements in and relating to Apparatus for Calculating the Ranges of Aircraft from the Observations of Range-finders.
• PERSON: PHILLIPS GEORGE FREDERICK

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