Main part of a working model of a differential analyser constructed from the construction toy, Meccano, made by Professor Douglas Hartree and Arthur Porter at University of Manchester, England, 1934. Reconstructed by Prof. Douglas Hartree at University of Cambridge, England, 1947 Meccano differential analyser, 1947 Mathematics 1934; 1947
Waiting Room Seat, Tottenham & Hampstead Junction Railway, pale wooden seat, varnished T & HJR carved on back. Overall: 875 mm x 2345 mm x 510 mm. Station seat, Tottenham & Hampstead Junction Railway Railway Furniture
Waiting Room Seat, Great Northern & Great Eastern Joint Committee, Ornate wooden bench, varnished. GN & GEJC carved on back. Wooden station bench, Great Northern & Great Eastern Joint Committee Railway Furniture
Two sets of 52 custom bridge playing cards, two jokers and two explanation cards in a presentation pack, where the court cards (jacks, queens, kings and jokers) are depicted as medical staff, and the Ace of Spaces as the then Master of the Worshipful Company of Makers of Playing Cards, Dr (Christopher) John Eaton, illustrated with images of the COVID-19 virus, designed by Stacey Jay Kelly, printed by Cartamundi, in England, and sold by the Worshipful Company of Makers of Playing Cards to raise funds for the Lord Mayor's Appeal, 2020 Playing cards depicting medical staff wearing PPE and carrying COVID-19 tests Public Health & Hygiene 2020
Working wood model, of a disc steam engine as patented by Taylor and Davies in 1836-8 and repeatedly trialled on land and at sea. Model of disc engine Marine Engines 1836-1857
Etchings with ruled line grounds (before 1852). Prepared as experimental trials of ground effect by ordinary mechanical means, no photo-etching involved. Three steel plates, in box, with rulings on surface varnish layer, 5" x 3 1/2". Three Varnished Steel Plates Marked With Parrallel Lines Photographs 1852
Working model, scale 1:12, of a proposed modified twin-cylinder or 'Siamese' paddle wheel engine to suit the requirements of screw propulsion with one crank and representing only half of the engine (c.1850), on wooden base, by Maudslay, Sons and Field, Lambeth, London, England, 1850-1900 Working model Marine Engines 1850-1900
