Aswan Dam under construction: Navigation Channel looking North
1900
Gustav Adolf Kroupa
1901
East Birmingham
1902
Photograph of the opening ceremony, Assuan Dam
1900-1901
Photograph of the Assuan Dam
1900-1901
Opening ceremony, Assuan Dam
1900-1901
Opening ceremony, Assuan Dam
1900-1901
Junior typewriter, c. 1907
1907
Rotator for Geissler tubes up to about 9 inches long
1905
Self-inductance, one henry
1900
Wilson gold leaf electrometer
1912
Keystone typewriter
1899
Ellam's circular duplicator
1901
Lithographic stone
circa 1900
Stentorphone soundbox for playing Hill-and-Dale (old type)
1912
Experimental slotted cone valve
1912
Stentorphone valve
1912
Parsons' Auxetophone reproducer
1903
Parsons' Auxetophone reproducer
1903
Mushroom valve soundbox
1912
Stentorphone valve
1912
Fine cut Stentorphone valve and seat
1912
Stentorphone soundbox for needle cut
1912
Diffraction grating area 5 cm by 4.5 cm on 8 cm by 7.5 cm (approx) block of speculum metal
1905-05-26
Concave Rowland diffraction grating on speculum metal
1898
Guhl's Pencil Pointer, 1905
1905
Edelmann typewriter, c. 1898
1898
Mignon typewriter
1905
Ayrton Mather portable ballistic galvanometer
1900
Industrial type of electrodynamometer
1901
Ideal typewriter, c. 1900
circa 1900
Smith's mercurial commutator
1902
Picht Braille typewriter
1899
Carbon filament lamp
circa 1905
Carbon filament lamp, M.E.S. cap, c.1905
circa 1905
Early Acousticon carbon granule aid, 1902
1902
Columbia "Home Premier" graphophone
1906
H.M.V. gramophone soundbox, 1901.
1901
Moya visible typewriter
1903
Liebig Condenser Tube
circa 1900
Liebig Condenser Tube
circa 1900
Simplex typewriter
1907
Merritt typewriter, 1899
1899
Holden's instrument
1902
Mechanical and pneumatic gramophone soundbox, 1908
1908
Phonograph speaker
1900
Experimental small cone diaphragm soundbox
1912
Armstrong typewriter, model No. 8, c. 1902
circa 1902
Marconi 'ganged-condenser'
1912
Small experimental air soundbox for gramophone
1912