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Transit theodolite, British, 1816-1850

Transit theodolite, British, 1816-1850

1816-1850
Astronomical Rotula produced by Thomas Jones 1817

Astronomical Rotula produced by Thomas Jones 1817

1817
7 inch altazimuth theodolite by Thomas Jones

7 inch altazimuth theodolite by Thomas Jones

1801-1850
Azimuth compass, British, 1811-1830

Azimuth compass, British, 1811-1830

1811-1830
Pocket set of drawing instruments in fishskin case

Pocket set of drawing instruments in fishskin case

1806-1861
Altazimuth theodolite, British, 1816-1850

Altazimuth theodolite, British, 1816-1850

1816-1850
Sector by Thomas Jones

Sector by Thomas Jones

1816-1850
Dumpy level by Thomas Jones, c. 1850

Dumpy level by Thomas Jones, c. 1850

1850
Kater-type Hygrometer by Thomas Jones, London, 1811-1814

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

1811-1814
Glover's sector

Glover's sector

1839-1850
Wet bulb maximum and minimum thermometer by Thomas Jones

Wet bulb maximum and minimum thermometer by Thomas Jones

1816-1850
Gunner's calliper in electrum and ivory

Gunner's calliper in electrum and ivory

1816-1850
Periscope with square mahogany body (17" long)

Periscope with square mahogany body (17" long)

Mercury-in-glass thermometer in sturdy brass surround

Mercury-in-glass thermometer in sturdy brass surround

1820-1850
Portable hygrometer by Thomas Jones

Portable hygrometer by Thomas Jones

1826
Pair of vibration magnetometer magnets 4 inches long and a brass comparison bar

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

1816-1850
Component, portable transit instrument

Component, portable transit instrument

Astronomical Rotula

Astronomical Rotula

1817
Descriptive leaflet for Astronomical Rotula produced by Thomas Jones 1817

Descriptive leaflet for Astronomical Rotula produced by Thomas Jones 1817

1817
Micrometer telescope

Micrometer telescope

1840-1860
Invariable Pendulum no. 6 with Agate Plane no. 6

Invariable Pendulum no. 6 with Agate Plane no. 6

1825
Component, portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Striding level for portable transit instrument

Striding level for portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Glass level, portable transit instrument

Glass level, portable transit instrument

Glass level, portable transit instrument

Glass level, portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Component, portable transit instrument

Refracting Telescope by Thomas Jones, 1815-1850; component

Refracting Telescope by Thomas Jones, 1815-1850; component

1815-1850
Component, portable transit instrument

Component, portable transit instrument

Circular Protractor

Circular Protractor

1816-1850
Double sounding sextant.

Double sounding sextant.

1806-1859
Case for refracting telescope of 3 1/2-inch aperture by Thos Jones

Case for refracting telescope of 3 1/2-inch aperture by Thos Jones

1815-1850
Invariable pendulum no. 11

Invariable pendulum no. 11

1827
Invariable Pendulum no. 4 with Agate Plane no. 4

Invariable Pendulum no. 4 with Agate Plane no. 4

1825
Clinometer rule, British Antarctic Expedition, 1901

Clinometer rule, British Antarctic Expedition, 1901

1816-1850
Maximum & minimum fahrenheit thermometer, 1818-1825

Maximum & minimum fahrenheit thermometer, 1818-1825

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

Thermometers

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

Marine barometer, by Thomas Jones, 1820-1830

1820-1830
Finder 10 3/8” by 7/8”, for refracting telescope by Thomas Jones, 1815-1850.

Finder for Refracting Telescope by Thos Jones

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

Eyepiece for Refracting Telescope by Thos Jones

1815-1850
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