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7 inch altazimuth theodolite by Thomas Jones

1801-1850

Periscope with square mahogany body (17" long)

Pair of vibration magnetometer magnets 4 inches long and a brass comparison bar

1816-1850

Altazimuth theodolite, British, 1816-1850

1816-1850

Gunner's calliper in electrum and ivory

1816-1850

Glover's sector

1839-1850

Transit theodolite, British, 1816-1850

1816-1850

Astronomical Rotula produced by Thomas Jones 1817

1817

Mercury-in-glass thermometer in sturdy brass surround

1820-1850

Portable hygrometer by Thomas Jones

1826

Kater-type Hygrometer by Thomas Jones, London, 1811-1814

1811-1814

Azimuth compass, British, 1811-1830

1811-1830

Sector by Thomas Jones

1816-1850

Wet bulb maximum and minimum thermometer by Thomas Jones

1816-1850

Pocket set of drawing instruments in fishskin case

1806-1861

Dumpy level by Thomas Jones, c. 1850

1850

Clinometer rule, British Antarctic Expedition, 1901

1816-1850

Maximum & minimum fahrenheit thermometer, 1818-1825

1818-1825
Two thermometers, 1818, by Thomas Jones, used in pendulum experiments

Thermometers

1818
Dummy invariable pendulum no. 4, c. 1825, part of 1914-583 and 1914-584

Dummy invariable pendulum no. 4

1825
Dip sector made by Thomas Jones, London, about 1845. Lacquered brass frame and index arm, polished limb, a hinged wooden handle. Signed on the limb: Thomas Jones 62 Charing Cross London. Marked on the limb: I 1. Inlaid silver scale from -5° to 40° every 10' (from left to right). Silver vernier by 10", zero at the left. The double-ended tangent screw and the clamping screw are on the back of the index arm. No shades. Index-glass adjustment by screw; adjustment of the horizon glass by capstan screws. A detached magnifier. Threaded telescope bracket in two parts, fitted for correcting collimation error by capstan screws; perpendicular adjustment by rising-piece and a milled knob. Telescope in two parts at a right angle, containing a prism; a shaded eyepiece (grey). No box. The observer looks through the telescope and sees reflections of the horizon on either side of him, at an angle of 180°. The horizons are brought into one line by moving the index arm, and the dip or rise of the horizon is read from the scale. I 1 was the Hydrographic Office serial numbering adopted in February 1828, where I was the letter presumably given to dip sectors.

Brass dip sector.

1840-1850
Portable transit instrument of 2¼-inch aperture by Thomas Jones, London, with striding level, lamp and glass screen in a fitted box. Accessories include 7 glass levels, 1 magnifier, 2 eyepieces, 2 dark slides and a micrometer slide.

Portable transit instrument of 2¼-inch aperture by Thomas Jones

1816-1850
Double sounding sextant made by Thomas Jones, London, about 1830. Two polished brass sextant frames and limbs connected parallel to each other by pillars and a brass plate; two wooden handles, one the front the other on the back of the frames. Signed on the limb of the upper sextant: Thomas Jones 62 Charing Cross London. Marked on the crossbar of the upper sextant: D.170. Two inlaid silver scales, each from -2° to 143° every 20', measuring to 128°. Two silver verniers both to 30". Two index arms, the tangent screw and clamping screw is on top of the upper arm; the lower tangent screw and clamping screw are on the back of the lower frame. No shades. Adjustment of the index and horizon glasses by square-headed screws and a detached key (not found). The magnifier on the upper sextant is on a 80-mm swivelling arm; that on the lower sextant is on a 100-mm swivelling arm mounted on the back of the frame. Threaded telescope bracket in two parts, fitted for correcting collimation error; the bracket is fixed between the two frames. Telescope (165 mm) with a shade (red), erect image. Sight tube (155 mm). The limb of the lower sextant is fitted with a greatest angle clamp (see notes). Box not seen, WMB. A trade label for Thomas Jones, London taken from the box.

Double sounding sextant.

1825-1835
Eyepiece for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Eyepiece fitted with dark glass, for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Finder 10 3/8” by 7/8”, for refracting telescope by Thomas Jones, 1815-1850.

Finder for Refracting Telescope by Thos Jones

1815-1850
Telescope "G10" engraved Thos Jones, Charing Cross, London, "3 1/2" O.G. body 3' 7 1/2" long 3 3/4" diam, 3 inverting eye pieces, 1 erecting eyepiece, tube with two powers, 2 dark glasses, 1 brass cap for eye end, finder 10 3/8" x 7/8", in mahogany box with key

Telescope "G10" engraved Thos Jones, Charing Cross, with case

1815-1850
Micrometer telescope, Rochon type, with box, by Thomas Jones, 62 Charing Cross, London, England, c. 1830

Micrometer telescope

1840-1860
Invariable pendulum no. 10 with agate plane no. 10, 1827, by Thomas Jones. In box with telescope, thermometers and accessories

Kater's invariable pendulum, 1827

1827
Invariable pendulum no. 11, with agate plane, 1827, by Thomas Jones

Invariable pendulum no. 11

1827
Invariable pendulum no. 4 with agate plane no. 4, by Thomas Jones, c. 1825

Invariable pendulum no. 4 with agate plane no. 4

1825
Invariable pendulum no. 6 with agate plane no. 6, by Thomas Jones, c. 1825

Invariable pendulum no. 6 with agate plane no. 6

1825
Syphon barometer by Thomas Jones, 62 Charing Cross, London

Syphon barometer by Thomas Jones

1820-1850
Two clinometers, jointed-rule type, one by Thomas Jones, first half 19th century, ex Antartic Expedition 1901, the other unsigned

Two Clinometer rule, British Antarctic Expedition, 1901

1816-1850
Descriptive geometry models (12 made of thin card) designed by Thomas Jones, M.I.M.E., published by John Heywood

Descriptive geometry models (12 made of thin card) designed by Thomas Jones

Micrometer telescope by T. Jones (Rochon type)

Micrometer telescope by T. Jones (Rochon type)

Reduction plate by Jones, engraved "Thomas Jones 62 Charing Cross, London", outside dimensions of brass frame are 8 3/8" x 6 3/16" and nearly 1/4" thick, glass has cross lines on under surface 7" x 5", each inch divided into 12 parts, mahogany box 9" x 6 3/4" x 7/8" with Jones's card inside

Reduction plate by Jones, with case.

1816-1850
Artificial mercury horizon with mercury container and storage case with trade card, made by Thomas Jones, 62 Charing Cross, London, 1835-1845. Consists of a rectangular metal trough, with wooden lining, and loose fitting roof-shaped brass cover with side glazed panels. The mercury bottle is a flat wooden container with wood screw stopper. Marked, ‘F.26.’ the property mark of the Hydrographic Office of the British Admiralty (adopted February 1828).

Artificial mercury horizon.

1835-1845
Bullock's circular protractor, 6 inch, divided on silver to 1/2 degree, reading by vernier to 1', with tubular radial arms; engraved "Thomas Jones, 62 Charing Cross, London" and "R.109", in case

Bullock's circular protractor

1816-1850
Artificial glass horizon, made by Thomas Jones, 62 Charing Cross, City of Westminster, London, around 1910. Consists of rectangular brass anodized base holding a blackened glass mirror plate with three levelling feet (lacking spirit level). Used by the British Hydrographic Office, marked with ownership number, F84 (adopted in February 1828).

Artificial black glass horizon.

1850-1861
Tube with two powers for refracting telescope by Thomas Jones, 1815-1850.

Tube with Two Powers for Refracting Telescope by Thos Jones

1815-1850
Eyepiece marked 3, for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Eyepiece marked 5, for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Eyepiece fitted with dark glass, for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Eyepiece fitted with dark glass, for refracting telescope by Thomas Jones, 1815-1850.

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
Brass cap for eye end, for refracting telescope by Thomas Jones, 1815-1850.

Brass Cap for Refracting Telescope by Thos Jones

1815-1850
Set square, metal, by Thomas Jones, 60 degrees, in metal 3/16" thick, bevelled at base and hypotenuse, at bottom of perpendicular is a brass scale 1" long divided into tenths, J.D. Potter's card inside triangular wood case

Set square

1806-1861
Kew Pattern Unifilar Magnetometer on table top stand by Thomas Jones, 4 Rupert Street, London, 1851-59. Fitted with a mercury thermometer.

Unifilar Magnetometer, Kew Pattern, 1851-1859, on table top stand, with accessories

1851-1859
Sympiesometer, No. 29, by Thomas Jones, 62 Charing Cross, London, England, 1818-1820

Sympiesometer, by Thomas Jones, 1818-1920

1818-1820
Marine barometer by Thomas Jones, 62 Charing Cross, London, England, 1820-1830

Marine barometer, by Thomas Jones, 1820-1830

1820-1830