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  2. File:Multiplication Table.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Multiplication_Table.pdf

    File:Multiplication Table.pdf. Add languages. ... Multiplication Table from 1 to 10. Date: 15 September 2014: ... You are free: to share – to copy ...

  3. Hourglass - Wikipedia

    en.wikipedia.org/wiki/Hourglass

    An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity. Typically, the upper and lower bulbs are symmetric as they ...

  4. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations In mathematics , a multiplication table (sometimes, less formally, a times table ) is a mathematical table used to define a multiplication operation for an algebraic system.

  5. Metric time - Wikipedia

    en.wikipedia.org/wiki/Metric_time

    1.67 minutes (or 1 minute 40 seconds) 10 3: kilosecond: 1 000: 16.7 minutes (or 16 minutes and 40 seconds) 10 6: megasecond: 1 000 000: 11.6 days (or 11 days, 13 hours, 46 minutes and 40 seconds) 10 9: gigasecond: 1 000 000 000: 31.7 years (or 31 years, 252 days, 1 hour, 46 minutes, 40 seconds, assuming that there are 7 leap years in the interval)

  6. Marine sandglass - Wikipedia

    en.wikipedia.org/wiki/Marine_sandglass

    [2] [3] Filled with the amount of sand suitable for measuring a lapse of half an hour, each time the sand emptied was also called a "glass"; eight glasses (four hours) defined a "watch". [ 2 ] [ 3 ] The times determined by the sandglass, along with the record in the logbook of the speed measured with the " chip log ", permitted the ship's ...

  7. Six-hour clock - Wikipedia

    en.wikipedia.org/wiki/Six-hour_clock

    Download as PDF; Printable version; In other projects Wikidata item ... Six-hour clock may refer to: Thai six-hour clock; Italian six-hour clock ; This page was last ...

  8. Mengenlehreuhr - Wikipedia

    en.wikipedia.org/wiki/Mengenlehreuhr

    Hour: The next two rows of 8 light switches are the hour mark, using a similar BCD system, where the upper row is a multiplier of 5, and the lower row is a multiplier of 1. Therefore the maximum hour number is 4*5+4=24 and the minimal hour number is 0 where everything is OFF. Since a 24-hour clock uses a number from 0-23.

  9. Rolling ball clock - Wikipedia

    en.wikipedia.org/wiki/Rolling_ball_clock

    The original design of the rolling ball clock has three main rails – two labeled for minutes and one for hours. The bottom rail represents the hours, the middle rail represents the minutes in multiples of 5 or 10, while the top rail represents single minutes 1 through 4.

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