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  2. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For a real-life situation where 750 represents a whole 100%, these readings could be interpreted to suggest that 150 is 20%, 225 is 30%, 300 is 40%, 375 is 50%, 450 is 60%, and 600 is 80%. Other scales

  3. Archimedes - Wikipedia

    en.wikipedia.org/wiki/Archimedes

    Described by Vitruvius, Archimedes' device may have been an improvement on a screw pump that was used to irrigate the Hanging Gardens of Babylon. [49] [50] The world's first seagoing steamship with a screw propeller was the SS Archimedes, which was launched in 1839 and named in honor of Archimedes and his work on the screw. [51]

  4. List of Neighbours characters introduced in 1987 - Wikipedia

    en.wikipedia.org/wiki/List_of_Neighbours...

    A few days later, Henry buys a round of drinks with a $50 note and Kenny memorizes the last three serial digits and causes trouble for Henry and his mother Madge (Anne Charleston) by telling her she short-changed him and after Kenny recites the serial number to Madge and Henry's boss, Paul Robinson (Stefan Dennis), she gives Kenny $45 in change ...

  5. Electric battery - Wikipedia

    en.wikipedia.org/wiki/Electric_battery

    The rated capacity of a battery is usually expressed as the product of 20 hours multiplied by the current that a new battery can consistently supply for 20 hours at 20 °C (68 °F), while remaining above a specified terminal voltage per cell. For example, a battery rated at 100 A·h can deliver 5 A over a 20-hour period at room temperature. The ...

  6. Willis Tower - Wikipedia

    en.wikipedia.org/wiki/Willis_Tower

    Contractors excavated the lot to a depth of 50 feet (15 m), and they removed 180,000 cubic feet (5,100 m 3) of dirt from the site. [27] By that November, Spencer, White & Prentis Inc. was excavating a trench around the site, measuring 60 feet (18 m) deep and 20 by 216 feet (6.1 by 65.8 m) across.

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