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Medium (Staff-only) Leather Remove constraint Medium (Staff-only): Leather

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    • 1972

    Developed in 1972, the HP-35 was Hewlett Packard's first pocket calculator and the first pocket calculator ever to have transcendental functions. Twenty HP engineers spent two years and approximately $1 million…

    • 1880 – 1899

    This leather case, most likely a domestic kit designed for home use, appears to contain vials of powder China paint pigments, which are commonly used on porcelain/ceramic.

    Folding black leather case that can be secured…

    • circa 1950

    Hardwood case with a leather handle and metal hinges and clasp; aluminium interior instrument panel has black finish; instructions on paper are inside the lid; the instrument panel features four black plastic knobs, two…

    • circa 1960

    Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

  1. Rectangular wooden box; brown leather handle attached to top with metal fasteners; front has a steel lock screwed to it; lock is stamped with manufacturer; four hard black rubber feet on bottom; top attached with two…