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Description: | 29 (Kelvin bequest number in ink on the makers label). H.G. BLAIR & C0. FROM BRISTOL ESTD 1829Chronometer Makers OPTICIANS & COMPASS ADJUSTERS. 95, BUTE STREET CARDIFF> CHRONOMETERS LENT ON HIRE. RE-SPRUNG, ADJUSTED AND RATED. [T]IME SIGNALS RECEIVED DAILY FROM THE ROYAL OBSERVATORY GREENWHICH. ADMIRALTY CHART AGENTS. (Makers trade plated printed on a paper label stuck to the inside of the lid of the box). 0-105 (engraved on the ivory scale in divisions of one degree and sub divisions of 20 minutes). 0-20 (engraved on the ivory Vernier scale in divisions of one minute). MANU H.G. Blair and Company mid 19th century Cardiff, Wales DES after HADLEY,John. 1730 England This is a ten and three quarter inch ninety degree reflecting quadrant was owned by William thomson Lord Kelvin. It has a 275 mm radius scale with divisions of twenty minutes and can be read to one minute. It has a single vertical and an arched strut with a reinforced index arm and a tangent screw clamp. It also has a double pinhole backsight.This instrument, a developement of the back staff, is in reality an octant since the mirror halves the scale. In modern usage allsuch instruments are called sextants regardless of the size of the scale. | License: | http://www.hmag.gla.ac.uk/spirit/rights/ | Publisher: | Hunterian Museum and Art Gallery, University of Glasgow | Rights holder: | Hunterian Museum and Art Gallery, University of Glasgow | Subjects: | SCIENTIFIC COLLECTION : | Source: | Hunterian Museum | Creator: | Hunterian Museum and Art Gallery, University of Glasgow | Identifier: | http://www.huntsearch.gla.ac.uk/cgi-bin/... | Language: | en-GB | Go to resource |
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