Ready reckoner with cursor Ready reckoner with cursor, plastic, for temperature-pressure relation of ICI refrigerants. Materials: plastic (unidentified) Object Number: 1988-308/1 type: ready reckoner Image © The Board of Trustees of the Science Museum
Plastic case for ready reckoner Plastic case printed "Unitor Ships Service. Refrigerant Slide Rule", for ready reckoner with cursor. Materials: plastic (unidentified) Object Number: 1988-308/2 type: case Image © The Board of Trustees of the Science Museum
Electromechanical calculating machine by Heinrich Diehl GmbH, Nuremberg, model EVM 18, " Archimedes Lizenz", serial no. 18851 Electromechanical calculating machine by Heinrich Diehl GmbH
Fowler's "pocket watch" type calculator with "winder" turning scales on one side and second handle turning scale on the other. No. 12362. Fowler's "pocket watch" type calculator
Cymagraph, formerly the property of the inventor, Prof R. Willis, in wood case Cymagraph, formerly the property of the inventor
