A few examples of appraisal values for
DOLLOND

• DOLLOND LONDON ENGLISH BINOCULARSDESCRIPTION:
  DOLLOND LONDON ENGLISH BINOCULARSDESCRIPTION: A pair of Dollond, London English binoculars features a metal foundation with brown leather wrapped design and brass end caps. Marked "Dollond London" CIRCA: Early 20th Cent. ORIGIN: London DIMENSIONS: W: 2.5" x L: 5" Have a similar item to sell? Contact: Info@Akibaantiques.com. CONDITION: Great condition. See lot description for details on item condition. More detailed condition requests can be obtained via email (info@akibaantiques.com) or SMS(305)-332-9274. Any condition statement given, as a courtesy to a client, is only an opinion and should not be treated as a statement of fact. Akiba Antiques shall have no responsibility for any error or omission."
• 19TH C. DOLLOND & CO. BRASS MICROSCOPE
  19TH C. DOLLOND & CO. BRASS MICROSCOPE IN CASE Dollond & Company (English, 1750-2015), 19th century. Lacquered brass microscope having a square stage, gimbaled mirror, and on a black iron tripod base; in case. Marked to base with label to case. Approx. h. 11"; case, h. 10.75", w. 5.75", d. 5".
• DOLLOND ROLLING RULE BRITAIN, CIRCA
  DOLLOND ROLLING RULE BRITAIN, CIRCA 1780 RULER LENGTH 12". CASE HEIGHT 1". LENGTH 12.75". WIDTH 2.75".DOLLOND ROLLING RULE, Britain, Circa 1780, By Peter Dollond (British, 1731-1821). Signed on one end "Dollond London 1673". Ebony ruler with ivory inch scales on either long edge, divided by tenths. One side is beveled downward for map reading and plotting, and the other side is beveled upward for ink drawing. Roller arm with two milled brass wheels with ivory readouts in tenths of inches and geared to drive a central pointer reading against an enameled dial likewise divided into tenths of an inch. Original fitted wood case bound in fish skin, lined in green velvet and with three brass catches. Dimensions: Ruler length 12". Case height 1". Length 12.75". Width 2.75". Provenance: Tesseract, Hastings-on-Hudson, New York.The Kelton Collection of Marine Art & Artifacts.Notes:This is the sophisticated mechanical readout version of the rolling rule invented by A.G. Eckhardt of London in 1771 (British patent #985). He apparently left the patent with Peter Dollond. When used with care, the ruler permitted rapid two dimensional plotting of points on a graph. It is most rare.
• CASED DOLLOND SEXTANT LAST QUARTER OF
  CASED DOLLOND SEXTANT LAST QUARTER OF THE 19TH CENTURY CASE HEIGHT 5". LENGTH 10.75". WIDTH 12.5".CASED DOLLOND SEXTANT, Last Quarter of the 19th Century, Wedge-shaped walnut case. Dimensions: Case height 5". Length 10.75". Width 12.5".
• OCTANT BY GILBERT & SONS, LONDON AND
  OCTANT BY GILBERT & SONS, LONDON AND OTHER PROPERTY OF JOHN ADAMS LATE 18TH/EARLY 19TH CENTURYOCTANT BY GILBERT & SONS, LONDON AND OTHER PROPERTY OF JOHN ADAMS, Late 18th/Early 19th Century, Collection of John Adams (1757-1807), of Edmonton, England, who maintained a practice of instruction in navigation and mathematics. Descended directly through his family. Included are his fine octant, a framed engraving of himself, a group of letters in his possession and a splendid silver medal he was awarded. 1) Ebony and brass "T" frame octant, circa 1806, signed "Gilbert & Sons London" on the 12" brass radius arm. Fitted with screw clamp, inset ivory 0-90 degree scale, pinhole sight, solar filters, auxiliary telescope with eyepiece, fine rotary adjustment of the index mirror rather than the horizon mirror, handle and feet. Complete with original keystone-shaped box with the partial trade label of "Gilbert & Sons, late Gilbert & Wright, No. 148 Leadenhall Street ..." selling "Improved achromatic plated and brass telescopes, Octants...". The octant dates from 1806, when "Gilbert & Sons" took over from "Gilbert & Wright". Length of radius arm 12". Scale arc 9.5". 2) Print of John Adams by J.T. Smith, published in 1795, with a paper fragment showing the signature "J. Adams". (Fragment previously attached to the back of the print.) Framed 11" x 13". 3) Group of letters that reveal astronomical and mathematical practices of the day. One, written in 1779 to an unknown recipient, is from Jonathan Wheatcroft of Paxford (in the Cotswolds), reporting on his failure to observe a new comet, even with his "2-1/2" Foot Improved Achromatic Dollond telescope. Another is from Charles Small of Ferryhill, writing to Jonathan Lindsay of London, discussing complicated problems in plane geometry, complete with proof and various kind words about colleagues and family. Complete with remains of a wax seal, and early postal markings. 4) Silver presentation medal "Arts and Commerce Promoted", inscribed "To Mr. John Adams, 1785" for "Artificial Horizon Improved". In the Society's records, twelve pages were devoted to Adams' improvement. In seeking an instrument capable of measuring arcs up to 180 degrees, for use with his new horizon, Adams turned "to Messrs. Gilbert & Wright, who immediately presented me with an improved Quadrant, by which the fore and back observations are equally facile and just". Medal in excellent condition, in its original wood case lined in green velvet and covered in shagreen. Diameter 1.75". Provenance: John Adams, and thence by descent through the Adams family.Gorrings, East Susex, United Kingdom, April 2007.Acquired by Tesseract, Hastings-on-Hudson, New York, at the above sale.Acquired by the Kelton Foundation from the above, March 2008.The Kelton Collection of Marine Art & Artifacts.John Adams worked in Edmonton, Middlesex, seven miles north of London. In 1782 he revised and corrected James Atkinson's epitome of the Whole Art of Navigation. In his preface of that year, Adams explains "The present reviser, having been eight years in the fea fervice, and eighteen a teacher of this art, enables him to say ... that he has now rectified what was amifs; alterered [sic] what was diforderly; explained what was obfcure; ftruck out what was not abfolutely neceffary; and copioufly added where it was wanting, ...".
• A DOLLOND OF LONDON ENGLISH BAROMETERA
  A DOLLOND OF LONDON ENGLISH BAROMETERA Dollond of London English barometer, First-half 19th Century Marked: Dollond / London A mahogany bowfronted mercury stick barometer with silvered vernier scale calibrated in barometric inches and labeled "Fair / Change / Rain" with vernier setting screw, a thermometer in Fahrenheit and Reaumur scale, and a vase-style cistern cover to base 38" H x 4" W x 3.75" D Dimensions: 38" H x 4" W x 3.75" D
• MARINE TELESCOPE, SIGNED "DOLLAND LONDON"
  MARINE TELESCOPE, SIGNED "DOLLAND LONDON" Marked "Day or Night," 2nd quarter 19th century (a pirated version of a Dollond spy glass): Bright mahogany barrel with long brass draw and an extending hood at front; 20 in. L. closed, and 39 1/8 in. L. open.
• DIMINUTIVE DOLLOND BRASS AND MAHOGANY
  DIMINUTIVE DOLLOND BRASS AND MAHOGANY TELESCOPEDiminutive Dollond Brass and Mahogany Telescope ; 19th c., marked "Dolland/London", three drawtubes, l. 6 in., l. (extended) 16 3/4 in.; together with a larger English brass and mahogany three-draw telescope, l. 12 in., l. (extended) 33 1/2 in Provenance: Collection of Brooke and Maria Fox, Metairie, LA
• BIRDSEYE MAPLE STICK BAROMETER, DOLLONDFine
  BIRDSEYE MAPLE STICK BAROMETER, DOLLONDFine William IV Birdseye Maple Bow-Fronted Stick Barometer ,c. 1837, silvered-brass scale marked "Dollond, London", sliding rack and pinion vernier with set key; thermometer showing Fahrenheit and Reaumur scales, case with ebony inlay, fitted with bowed glass, h. 38 in., w. 4 1/2 in., d. 3 1/2 in Provenance: Collection of Brooke and Maria Fox, Metairie, LA
• SINGLE-DRAW TELESCOPE PROBABLY ENGLAND,
  SINGLE-DRAW TELESCOPE PROBABLY ENGLAND, EARLY 20TH CENTURY LENGTH 27.25”.SINGLE-DRAW TELESCOPE, Probably England, Early 20th Century, Mahogany tube with silver plated fittings. Marked "Dollond, London" on eye cap. Dimensions: Length 27.25".
• DOLLAND BRASS SINGLE-DRAW TELESCOPE
  DOLLAND BRASS SINGLE-DRAW TELESCOPE LONDON, 19TH CENTURY LENGTH CLOSED 25.5”. LENGTH EXTENDED 31”.DOLLAND BRASS SINGLE-DRAW TELESCOPE, London, 19th Century, Marked "Dollond London 6478 Cecil Mocatta". Leather wrap. Dimensions: Length closed 25.5". Length extended 31".
• DOLLOND CASED IRON AND BRASS TRANSIT
  DOLLOND CASED IRON AND BRASS TRANSIT SCOPE 19TH CENTURY SCOPE LENGTH 22”. CASE HEIGHT 8”. WIDTH 3.5”. DEPTH 19.25”.DOLLOND CASED IRON AND BRASS TRANSIT SCOPE, 19th Century, With mounts. Dimensions: Scope length 22". Case height 8". Width 3.5". Depth 19.25".
• RARE LEFT-HANDED BRASS DOUBLE T-FRAME
  RARE LEFT-HANDED BRASS DOUBLE T-FRAME SEXTANT BY JOHN BENJAMIN DANCER CIRCA 1850 SEXTANT HEIGHT 9.5". WIDTH OF ARC 10.5". BOX HEIGHT 5". WIDTH 11". WIDTH 10.5".RARE LEFT-HANDED BRASS DOUBLE T-FRAME SEXTANT BY JOHN BENJAMIN DANCER, Circa 1850, Signed on the radius "Dancer Manchester" for John Benjamin Dancer (British, 1812-1887). Formed with strips of brass in duplicate and joined with turned brass pillars. Brass arc inset with a silver scale calibrated from 0-150. Fitted with an index arm with clamp and tangent screws, magnifier, vernier scale, lignum vitae handle, two sets of colored filters and telescopic lens with the telescope fitting into the right side and the ebony handle mounted on the left. Fitted mahogany box with additional lenses and accessories. Dimensions: Sextant height 9.5". Width of arc 10.5". Box height 5". Width 11". Width 10.5". Provenance: Christie's, South Kensington, 2011.The Kelton Collection of Marine Art & Artifacts.Notes:John Benjamin Dancer, optician and scientific instrument maker, was the inventor of microphotography. Born in London, Dancer, at different times, held apprenticeships with Ramsden, Dollond and Troughton. In 1841 he established a partnership, Abraham & Dancer, in Manchester. After 1845 he worked alone.
• A pair of faux tortoiseshell opera glasses
  A pair of faux tortoiseshell opera glasses by Negretti & Zambra in outer leather case, a pair cased by Callaghan and another pair by Dollond, two cameras and a leather wallet
• An oak cased barometer by Dollond, 91cm
  An oak cased barometer by Dollond, 91cm high
• UNIVERSAL EQUINOCTIAL RING DIAL, DOLLOND,
  UNIVERSAL EQUINOCTIAL RING DIAL, DOLLOND, LONDON LATE 18TH / EARLY 19TH CENTURY 9-inch, in lacquered brass, signed under the degree scale 'Dolland, London', the pivoted inner chapter ring with hours I-XII-I-XII divided to 5 minutes, the outer equinoctial ring with degree scale 90-0-90° and declination scale to reverse, the pivoted bridge with sliding pinhole gnomon on calendrical and zodiac scales, the rim with sliding suspension loop27cm high
• English Brass Sextant Dollond London
  English Brass Sextant Dollond London early 19th century signed on the arc in fitted mahogany case 5.25" (height) 13.3cm (height) 14.25" (width) 36.2cm (width) 11.5" (depth) 29.2cm (depth)
• A George V silver cased pocket aneroid
  A George V silver cased pocket aneroid barometer by Dollond London with silvered rotating dial contained in engine turned case 3.25ins diameter (slightly damaged) with red leather outer case for same (outer case extensively damaged)
• A 20th Century four drawer telescope
  A 20th Century four drawer telescope by Dollond London in leather case
• AN ENGLISH BRASS SURVEYING Y LEVEL BY
  AN ENGLISH BRASS SURVEYING Y LEVEL BY GEORGE DOLLOND
  the 1 inch telescope with bubble level, the finely divided and silvered compass signed Dollond London, with staff head mount with four milled screws and fine adjustment, extension tube, objective and lens cap, in fitted mahogany box with maker's engraved trade label with 59 St Paul's Churchyard address, early 19th c