Circular Slide Rule, William J. Powell, 1935. Creator: UnknownDuring the 1920s William J. Powell led a small group of black air enthusiasts in Los Angeles. He established the Bessie Coleman Flying Club in 1929
Computer, Weems E-1B Navigational. Creator: Weems System of NavigationWhite plastic dead reckoning computer used for aerial navigation. The circular computer has three discs for ground speed, mileage and course
Dead reckoning computer owned by Sally Ride. Creator: Telex Communications IncThis TELEX E-6B dead reckoning computer belonged to Dr. Sally K. Ride. It is a circular slide rule used in aviation for calculating factors such as fuel burn, wind correction, ground speed
Administration office at Huntsman House, Leeds, West Yorkshire, 1968. Huntsman House was the headquarters of Tetleys brewers
Clerk using a Pascal adding machine, 1835Clerk using an adding machine of the type developed by Blaise Pascal (1623-1664), 1835. (Colorised black and white print)
Super calculating machine, 1938. Churchmans cigarette card, from a series titled Modern Wonders [WA & AC Churchman, Great Britain & Ireland, 1938]
Charles Babbages Difference Engine No 1, prototype calculating machine, 1824-1832. Artist: Joseph ClementCharles Babbages Difference Engine No 1, prototype calculating machine, 1824-1832. English mathematician Charles Babbage (1791-1871)
Pascals digital counting machine of 1642, 1751-1780Blaise Pascals (1623-1664) digital counting machine (1642) showing (top) two of the train of number wheels which were viewed through windows in the casing of the machine
George and Edward Scheutzs calculating machine. Based on Babbages difference engine, it was developed between 1837 and 1843. Purchased for Dudley Observatory, Albany, New York
