Specimen of Dover-Calais telegraph cable, 1851
1851
Cylinder electrical machine, 1810-1817
1810-1817
Every ready battery, 1917
1917
Circular plate in metal framework with central hole
1800-1850
Six lenses of varying size and type
Model of Callendar's Sunshine Receiver, 19th Century
1895-1910
James Goddard type Cloud Mirror, 1862
1862
Block of lenses (4) on iron polishing tool
1909
Block of lenses (7) ground with fine emery by J.H. Dallmayer Ltd.
1909
Two-Core Edison Tube
1882
Tutton's goniometer, for cutting, grinding and polishing minerals, with case and components
1894
29 pieces of square glass plate; three convex lenses
1800-1850
Speculum Metal Mirror, 1840-60
1840-1860
Large block of 'Adew' lenses (62) partly polished by J. H. Dallmayer Ltd.
1909
Concave iron block with crystal quartz attached
Polished glass blank in mount
Polished glass blank
Model of a birch bark canoe from North America
1926-1936
Four speculum metal secondary mirrors thought to have been made by James Nasmyth
1850-1870