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George Wright
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Individual
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Individual
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Publication of GB190408279ApublicationCriticalpatent/GB190408279A/en
8279. Wright, G. April 11. Rulers; squares; protractors.-A semicircular or other protractor B is pivoted to a blackboard ruler A, provided with a pointer a, and is clamped in any position by means of a loose washer D and tightening-nut E, or in any other manner. The device may be used to draw a line at any angle, and may be used separately as a T-square, set-square, ruler, or protractor.
GB190408279D1904-04-111904-04-11A Combined Ruler and Protractor for Blackboard use.
ExpiredGB190408279A
(en)