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Subject Metric system Remove constraint Subject: Metric system

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    • Undated

    Control Company introduced the first metric conversion calculator in 1978.

    • 1975

    Cachet depicts the wavelength of krypton-86, which was formerly used to define the meter from 1960 until 1983. A meter was defined during this time as the wavelength of the 605 nm (orange) spectral line of a krypton-86…

    • 1975

    Stamp depicts scales weighing jars of jam, with text, "2 1/4 lbs of Jam is a little more than a kilogram."