T-plotter: tool for plotting celestial lines of position
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United States of America Patent
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Issued Date -
Jun 27, 2013
app pub date -
Dec 27, 2011
filing date -
Dec 27, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The T-plotter is a T-shaped transparent plotting utensil consisting of two mutually perpendicular arms and equipped with a rotatable compass rose mounted on a shuttle sliding along its arm of symmetry. This device allows a simplified plotting of celestial lines of position according to the intercept method of Marcq St. Hilaire. The compass rose is used to dial in the required azimuth. The intercept distance is marked by sliding the shuttle to the appropriate distance from the top of the main body based on the latitude scale of the employed nautical chart.
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