GB190912631A - A New or Improved Protractor and Scale for use as an Instrument for the Rapid Working Out, by Construction, of Navigation Problems.
- Google Patents
A New or Improved Protractor and Scale for use as an Instrument for the Rapid Working Out, by Construction, of Navigation Problems.
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Expired
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Charles Bertram Lenthall
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Individual
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Individual
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Publication of GB190912631ApublicationCriticalpatent/GB190912631A/en
G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
G01C21/20—Instruments for performing navigational calculations
Abstract
12,631. Lenthall, C. B. May 28. Protractors; scales.-A combined protractor and scale, for use in working out navigation problems, consists of a card of transparent material divided radially from a central point A into points of the compass, degrees, or otherwise, and provided with a slit B marked with a scale extending from the central point A nearly to the edge of the instrument.
GB190912631D1909-05-281909-05-28A New or Improved Protractor and Scale for use as an Instrument for the Rapid Working Out, by Construction, of Navigation Problems.
ExpiredGB190912631A
(en)