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Star plotter
Plastic position line protractor.
A position line protractor made of cellulose-based plastic. It consists of: a semi-circular protractor marked from 0 to 90 by 1 degree in each quadrant; a horizontal scale marked 'POSITION LINE' and divided from 0 to 12 by 0.5 in each direction from the centre point, with a slot for marking the position line; and an extension rule marked 'INTERCEPT' with a scale divided from 0 to 20 by 0.5. The linear scales are in miles for use on a chart at a scale of 1:250,000.
A position line protractor made of cellulose-based plastic. It consists of: a semi-circular protractor marked from 0 to 90 by 1 degree in each quadrant; a horizontal scale marked 'POSITION LINE' and divided from 0 to 12 by 0.5 in each direction from the centre point, with a slot for marking the position line; and an extension rule marked 'INTERCEPT' with a scale divided from 0 to 20 by 0.5. The linear scales are in miles for use on a chart at a scale of 1:250,000.
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Object Details
| ID: | NAV1026 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Star plotter |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | circa 1940 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | 2 x 205 x 155 mm |