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Description: | Bradley's quadrant follows the same design as Halley's, the main difference being the metal used. After twenty years of use, the frame of Halley's iron quadrant had buckled under its own weight and become inaccurate. Bradley made his quadrant from brass, a lighter material, in order to overcome this problem. Bradley's quadrant also has an arc which has been hand-divided and signed by one of the great instrument makers of the day, John Bird.
Inscription. Tube in KB1288 10D, parts in WW272 13B. negative number B735
caption: Mural quadrant (AST0970), George Graham. Royal Observatory (ROG) December 2009
caption: Bradley?s 8-foot Brass Mural Quadrant | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Refracting telescope Quadrant mural quadrants The Old Royal Observatory Greenwich Observatory Telescopes | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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