reflecting circle
Datecirca 1810
Inventory Number5316
ClassificationReflecting Circle
Subject
Maker
Edward Troughton
1753 - 1835
Place of OriginLondon, England
Dimensionsreflecting circle: 12 × 26.5 × 26.5 cm (4 3/4 × 10 7/16 × 10 7/16 in.)
case: 12 × 30 × 30 cm (4 3/4 × 11 13/16 × 11 13/16 in.)
case: 12 × 30 × 30 cm (4 3/4 × 11 13/16 × 11 13/16 in.)
Material
AccessoriesSquare walnut box, U-shapedhandle assembly, additional handle, eye shade tube, telescope, eyepieces (2), screw driver, eyepiece shades (2), vernier magnifier
Description10.5" diameter circle, 9.75" across scales, 140°-0-140° scale subdivided to 20' with three verniers to 20", adjusted by screw. Three index shades and three horizon shades with mirrors and telescope mount are on the opposite side of circle from the scale. Scale magnifier is mountable at any of the three vernier locations.
SignedTroughton
Inscribed"Troughton London" on index arms and "212" in center.
Historical AttributesSee Brewington, M.V., Peabody Museum Collection of Navigating Instruments, 147 for picture of unit No. 11 (c. 1796) and Bennett, J.A., The Divided Circle, Fig. 106 for picture of unit No. 168 (c. 1806). Per Bennett, p. 135, this type reflecting circle was designed by Edward Troughton near the end of the 18th century.
Legey
Date: circa 1838
Accessories: shades with double tabs (4); shades with single tab (4); screwdriver and square key.
Object number: 5268
Troughton & Simms
Date: circa 1875
Accessories: 3 eyepieces; 1 diagonal; 1 set of shades; magnifier; dust cap; case.
Object number: 1996-1-0566
Henri Gambey
Date: circa 1830
Accessories: Walnut box labeled 5312b, handle, wood handled screwdriver brass adjustment tools (2), eyepiece shades (2), index shades (4), horizon shades (4), horizon aperature (1), peep sight, and stand 5312c
Object number: 5312a
Henri Gambey
Date: circa 1830
Accessories: Walnut box labeled 5312b, handle, wood handled screwdriver brass adjustment tools (2), eyepiece shades (2), index shades (4), horizon shades (4), horizon aperature (1), and peep sight
Object number: 5312b
Troughton & Simms
Date: 1826-1840
Accessories: mahogany box, telescope and sight tube (5), magnifying lens (vernier)
Object number: 5321a
Troughton & Simms
Date: 1826-1840
Accessories: mahogany box, telescope and sight tube (5), magnifying lens (vernier)
Object number: 5321b
Heath & Company, Ltd.
Date: 1875-1890
Accessories: 7 1/8" telescope, 3 1/4" shade tube, 3 1/4" telescope, eyepiece shade, and mahogany box. with "4" on lid and "H" on front
Object number: 5311
William Gerrard
Date: 1862-1890
Accessories: rectangular mahogany box, telescopes (2), sight tube, eyepiece shade, eyepiece
Object number: 5263
Spencer, Browning, & Company
Date: 1843-1850
Accessories: box with key, adjustment tool, telescope, eye tube, eyepiece shade
Object number: 5248
Riggs & Brother
Date: 1820-1840
Accessories: keystone mahogany box, telescope, eyepiece shade
Object number: 5245
Édouard Bouty
Date: circa 1930
Accessories: Rectangular mahogany box, eyepiece shades (2), horizon shades (3), index shades (3), sight tube, telescopes (2), adjustment tools (2), magnifier
Object number: 5258
Edward Troughton
Date: 1804-1826
Accessories: Mahogany keystone box, stenciled in white paint on top and side of lid "P. Townsend"; 2 Telescopes; 1 Eyepiece
Object number: 5308