Dummy invariable pendulum no. 4, c. 1825, part of 1914-583 and 1914-584 Dummy invariable pendulum no. 4 1825
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
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
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
Syphon barometer by Thomas Jones, 62 Charing Cross, London Syphon barometer by Thomas Jones 1820-1850
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
Micrometer telescope, Rochon type, with box, by Thomas Jones, 62 Charing Cross, London, England, c. 1830 Micrometer telescope 1840-1860
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
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
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
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
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
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
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
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
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
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
Key for wooden case, for refracting telescope by Thomas Jones, 1815-1850. Key for Case 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
Tube with two powers for refracting telescope by Thomas Jones, 1815-1850. Tube with Two Powers for Refracting Telescope by Thos Jones 1815-1850