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  2. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    child shoe size (barleycorns) = 3 × last length (in) − 11 3 ⁄ 4. equivalent to: child shoe size (barleycorns) ≈ 3 × foot length (in) − 9 3 ⁄ 4. Alternatively, a Mondopoint-based scale running from K4 to K13 and then 1 to 7 is in use. [12] K4 to K9 are toddler sizes, K10 to K13 are pre-school and 1 to 7 are grade school sizes.

  3. Brannock Device - Wikipedia

    en.wikipedia.org/wiki/Brannock_Device

    Brannock Device [1] Brannock Device at shoe museum in Zlín, Czechia The Brannock Device is a measuring instrument invented by Charles F. Brannock for measuring a person's shoe size . Brannock spent two years developing a simple means of measuring the length, width, and arch length of the human foot .

  4. Shoe-fitting fluoroscope - Wikipedia

    en.wikipedia.org/wiki/Shoe-fitting_fluoroscope

    This machine was manufactured by Adrian Shoe Fitter, Inc. circa 1938 and used in a Washington, D.C., shoe store Shoe-fitting fluoroscopes , also sold under the names X-ray Shoe Fitter , Pedoscope and Foot-o-scope , were X-ray fluoroscope machines installed in shoe stores from the 1920s until about the 1970s in the United States, Canada, United ...

  5. AC adapter - Wikipedia

    en.wikipedia.org/wiki/AC_adapter

    An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed in a case similar to an AC plug. [2] AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves.

  6. Voltage converter - Wikipedia

    en.wikipedia.org/wiki/Voltage_converter

    Switched-mode power supplies have become widespread in the early twenty-first century; they are smaller and lighter than the once-universal transformer converters, and are often designed to work from AC mains at any voltage between 100 and 250 V. Additionally, because they are typically rectified to operate at a DC voltage, they are minimally ...

  7. Power supply - Wikipedia

    en.wikipedia.org/wiki/Power_supply

    An external power supply, AC adapter or power brick, is a power supply located in the load's AC power cord that plugs into a wall outlet; a wall wart is an external supply integrated with the outlet plug itself. These are popular in consumer electronics because of their safety; the hazardous 120 or 240 volt main current is transformed down to a ...