Brass framed reflecting circle.

Made:
1820-1825 in St Paul's Churchyard
maker:
George Dollond
Reflecting circle made by George Dollond, London, about 1825

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Reflecting circle made by George Dollond, London, about 1825
Science Museum Group
© The Board of Trustees of the Science Museum

Reflecting circle made by George Dollond, London, about 1825. Circular lacquered brass frame, polished limb, and a wooden handle. Signed on the index arm: Dollond | London. Inlaid silver scale from 0° to 720° every 20'. Silver vernier on the index arm to 20", zero at the left. A polished brass scale on the inside of the limb to 180° every 5° on either side of zero. Silver vernier to 20", zero at the centre. A detached U-shaped bracket holds a third handle. Three rigidly connected arms moving with the brass scale, and the second vernier. The separately moving index arm carries the index glass and on the back a tangent screw working against a spring-loaded stop, and a clamping screw. A second tangent screw working against a spring-loaded stop, and clamping screw is on the back of one of the other arms. Index-glass adjustment by screw; adjustment of the horizon glass by capstan screws. Three hinged index shades (three red, one orange); three horizon shades (red, green, and orange). Two magnifiers on 70 mm swivelling arms, frosted glass shades. Threaded telescope bracket with perpendicular adjustment by rising-piece and a milled knob. Telescope (91 mm) erect image; telescope (162 mm) inverted image, one cross-wire, other(s) gone; extra draw tube (49 mm), four cross-wires; extra draw tube (49 mm), four cross-wires (damaged). Sight tube (84 mm); shaded eyepiece (green); adjusting pin. Square fitted wooden box painted brown on the outside.

Details

Category:
Surveying
Object Number:
1939-391
Materials:
mahogany (wood), felt, brass (copper, zinc alloy), steel (metal), glass, paper (fibre product), string and iron
Measurements:
overall: 205 mm x 300 mm x 256 mm, 6.195kg
type:
reflecting circle
credit:
Air Ministry, Meteorological Office