Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
Napier's Bones
1690
Model of early manual fire engine, ca. 1680.
1680
Small white cup in soft paste porcelain
1748-1763
Expedition Crane
1764
Plane table outfit by Benjamin Cole
1750-1766
Doorcase 56 Lincoln’s Inn Fields
circa 1750
Sector by Bion
1700-1720
Combined graphometer and plummet clinometer, 1663.
1663
Spring-driven Bracket Clock by Isaac Thuret
1665-1670
Astronomical quadrant with stand, 1685-1724
1685-1724
Demainbray's model scorpion catapult
1745-1755
Demainbray's Archimedean screw
1752
Mezzotint portrait of Benjamin Franklin
1762
wheel cutting machine
1668-1672 Probable
Telescope by John Yarwell.
1685-1695
Demainbray's convex lens
1750
Pocket microscope by Jeremiah Sisson
1752
Telescope by Christopher Cock
1673
Mural arc made for King George III
1770
Demainbray's syphon
1701-1752
Gunter quadrant
1650-1725
Pulley from long-case clock by Fromanteel
1660-1665
Gunter quadrant
1650-1725
Etching of an electrically powered garden
1755
Brass-bound lodestone
1675-1700
Escape wheel from long-case clock by Fromanteel
1660-1665
Demainbray's cometarium
1750-1760
Edmund Culpeper
1720
Demainbray's polemoscope
1701-1752
Demainbray's speaking trumpet
1700-1752
Clarke's Hydrometer (c. 1755)
1755
Thomas Tuttell
1695-1702
Barnard Tompion clock
1708
Demainbray's hydrostatic paradox vessels
1735-1752
Demainbray's wharf jib crane model
1729-1753
Demainbray's rat's tail crane model
1735-1753
George III's weighted cylinder
1762
Unweighted cylinder in frame
1762
Section of lightning conductor from St Paul’s cathedral
1769
Demainbray's turquoise disc
1745-1755
Spiral slide-rule
1663
Demainbray's yellow disc
1745-1755
Demainbray's Irish low-backed cart model
1735-1754.
Cupellation furnace
1696-1700
Trade card for John Yarwell, optician, London, England, 1697
1697
Square signed "J.Ramsden, 1757"
1757
Long mahogany strip brass pin gauge with five pins
1758-1769
Short mahogany strip brass pin gauge with eight pins
1758-1769
Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770