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Description: | 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.
Ex DI.101.
caption: Star Plotter - Front | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | celestial maps | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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