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Oersted Compass Needle, 1828

Oersted Compass Needle, 1828

1828
Sensitive gold-leaf electroscope

Sensitive gold-leaf electroscope

1820-1856
Vertical Reciprocating Steam Engine Model

Vertical Reciprocating Steam Engine Model

1818-1851
Magnetic engine

Magnetic engine

1840-1856
Glass prism in ball and socket joint on stand

Glass prism in ball and socket joint on stand

1828
Pseudoscope, 1845-1855

Pseudoscope, 1845-1855

1845-1855
Apparatus used by Wheatstone in his early researches in spectrum analysis

Apparatus used by Wheatstone in his early researches in spectrum analysis

1830-1839
Pseudoscope, 1850-1860

Pseudoscope, 1850-1860

1850-1860
Solar Microscope, 1616-1856

Solar Microscope, 1616-1856

1818-1856
Magnet rotating on its own axis

Magnet rotating on its own axis

1822-1856
Magnets rotating round a current

Magnets rotating round a current

1822-1856
Wooden model of a Harrison's grid-iron pendulum

Wooden model of a Harrison's grid-iron pendulum

1829
Helical coils revolving round a magnet

Helical coils revolving round a magnet

1822-1856
Dr. Potter's aerometric balance

Dr. Potter's aerometric balance

1850
Batteries revolving round the poles of a magnet

Batteries revolving round the poles of a magnet

1822-1856
Two Zamboni piles with spark gap

Two Zamboni piles with spark gap

1820-1856
Steelyard-type pocket chondrometer

Steelyard-type pocket chondrometer

1840-1856
Parts of apparatus for demonstrating thermoelectricity

Parts of apparatus for demonstrating thermoelectricity

1828
Brass disc fitted with glass handle and small brass discharging sphere

Brass disc fitted with glass handle and small brass discharging sphere

1828
Wooden model of a mercury compensated pendulum

Wooden model of a mercury compensated pendulum

1829
Apparatus to show the relative expansion of different liquids

Apparatus to show the relative expansion of different liquids

1828
Instrument to demonstrate "Persistence of Vision"

Instrument to demonstrate "Persistence of Vision"

1820-1840
Pulley Blocks

Pulley Blocks

1814-1851
Pulley Blocks

Pulley Blocks

1814-1851
Vertical Reciprocating Steam Engine Model

Vertical Reciprocating Steam Engine Model

1818-1851
Bell in vacuo demonstration,1820-1856

Bell in vacuo demonstration,1820-1856

1820-1856
Electromagnetic engine, about 1840

Electromagnetic engine, about 1840

1836-1845
Argand Lamp made by Watkins & Hill used by James Joule

Argand Lamp made by Watkins & Hill used by James Joule

1860
Metal hydrometer by Watkins and Hill (Salinometer). 9" long stem engraved Watkins & Hill London

Metal hydrometer by Watkins and Hill (Salinometer). 9" long stem engraved Watkins & Hill London

Electrostatic machine, wood frame, glass cylinder, metal fittings, by Watkins and Hill, 5 Charing Cross, London, second half 19th century

Electrostatic Machine, 1851-1856

1851-1856
Folding pocket spyglass, Watkins and Hill, London, 1750-1900

Folding pocket spyglass

1750-1900
Circular protractor 6-inch, engraved "Watkins and Hill Charing Cross London"; divided in degrees and numbered 0 to 360 degrees; in wood case with inlaid brass plate engraved "H.O. ^ 7"

Circular brass protractor, 1818-1856

1818-1856
Engraved copper plate for printing compass roses on prismatic compass cards, by Watkins and Hill, London, 1840.

Engraved copper plate for printing compass roses, by Watkins and Hill

1840
Developing box for Daguerreotype process, with thermometer by Watkins & Hill, 5 Charing Cross, London, c. 1839-40.

Developing Box for Daguerreotype process, 1839-1840

1839-1840
Pair of pulley blocks

Pair of Pulley Blocks

1814-1851
folding achromatic refracting telescope, opera glass type, with leather case, by Watkins and Hill, London, England, c. 1840.

folding achromatic refracting telescope

1835-1845
Balance

Balance, 1806-1840

1806-1840
Apparatus to show the relative expansion of different liquids, made by Watkins & Hill, 5 Charing Cross, London with 3 sealed glass tubes containing mercury, oil and (coloured) water respectively (A fourth tube is missing)

Apparatus to show the relative expansion of different liquids

1828
Protractor, semi-circular, by Watkins and Hill; diameter about 6 1/2", arm projects 6" beyond circle, engraved "Watkins and Hill, Charing Cross, London", "H.O.R." in case 14" x 5 1/4" x 7/8", mahogany

Protractor, semi-circular, by Watkins and Hill; diameter about 6 1/2"

Wollaston type camera lucida by Watkins & Hill, in leather case, English, date 1836

Wollaston type camera lucida by Watkins & Hill

1836
Stereoscopic daguerreotype by Watkins and Hill, c.1855.

Stereoscopic daguerreotype by Watkins and Hill

1855
Aepinas's condenser supplied by Watkins and Hill, Opticians, 5 Charing Cross, London, in 1828 for #5-8-0

Aepinas's condenser supplied by Watkins and Hill

1828