Replica of Lightning Conductor by Benjamin Franklin, United States, 1730-1760 1730-1760 (original); 1931-1939 (replica)
Dental instrument cabinet, by the S.S. White Dental Manufacturing Co., USA, 1935-1950 Dental instrument cabinet 1935-1950
Black and white silver gelatin photograph entitled 'Carlisle Indian School, Pennsylvania, Carpentry Lesson' dated 1903. From the Impressions Gallery exhibition, 'What a Woman Can Do With a Camera' 13 July - 25 August 1984 Carlisle Indian School, Pennsylvania, Carpentry Lesson 1903
Photolithography Machine used in the manufacture of microchips Photolithography Machine used in the manufacture of microchips 1975
Collotype print by Eadweard Muybridge, Plate 781, 'Chickens Scared by a Torpedo', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Chickens Scared by a Torpedo by Eadweard Muybridge 1887
Collotype print by Eadweard Muybridge, Plate 755, 'Pigeon Flying', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Pigeon Flying by Eadweard Muybridge 1887
Collotype print by Eadweard Muybridge, Plate 187, 'Woman Dancing (Fancy)', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Woman Dancing (Fancy) by Eadweard Muybridge 1887
Universal grinding machine used at the National Physical Laboratory, Teddington, and made by Landis Tool Co., Pennsylvania, USA, 1917. With components. Wartime universal grinding machine 1917
Collotype print by Eadweard Muybridge, Plate 728, 'Lioness Walking', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Lioness Walking by Eadweard Muybridge 1887
Collotype print by Eadweard Muybridge, Plate 228, 'Turning and Lifting a Water Jar from the Ground', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Turning and Lifting a Water Jar from the Ground by Eadweard Muybridge 1887
Collotype print by Eadweard Muybridge, Plate 163, 'Long Jump from Standing Start', from 'Animal Locomotion; an Electro-Photographic Investigation of Consecutive Phases of Animals Movements, 1872-1885', published in 1887. Print shows twelve frames from the side, and twelve frames of the same movement from the front. Long Jump from Standing start by Eadweard Muybridge 1887
Dental x-ray machine, wood cabinet, metal frame, by Ritter-Biber, from Dr. Kemp and Partners, German, about 1925 Dental x-ray machine 1920-1930
A 35mm slide taken by Tony Ray-Jones for an article about a honeymoon hotel in Pennsylvania, 'The All American Love Nest', published in the 'Sunday Times Magazine', 28 March 1971. Honeymoon Hotel, Poconos Mountains, Pennsylvania 1971
Amalgam proportioner, bakelite, by the J. Bird Moyer Co., USA, 1930-1940 Amalgam proportioner 1930-1940
Pennsylvania Rail-Road brochure describing Conway freight yard, on the Ohio River, near Pittsburg, c1957, the world's largest "push-button yard." 8pp. Conway Yard 1952-1962
Black and white silver gelatin photograph entitled 'Carlisle Indian School, Pennsylvania, Working in Smithy,' dated 1903. From the Impressions Gallery exhibition, 'What a Woman Can Do With a Camera' 13 July - 25 August 1984 Carlisle Indian School, Pennsylvania, Working in Smithy 1903
A black and white silver gelatin photograph entitled "Railroad depot, Bethlehem, Pennsylvania Nov.1935" by Walker Evans in November 1935. From the Impressions Gallery exhibition "From Shore to Shining Shore", shown 25 November - 24 December 1978. Railroad depot, Bethlehem 1935-11
A black and white silver gelatin photograph entitled "Memonite School, Hinkletown, Pennsylvania, 1942", taken by John Collier, in February 1942. From the Impressions Gallery exhibition "From Shore to Shining Shore", shown 25 November - 24 December 1978. Memonite School, Hinkletown, Pennsylvania 1942