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  2. Ruler - Wikipedia

    en.wikipedia.org/wiki/Ruler

    A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

  3. Scale ruler - Wikipedia

    en.wikipedia.org/wiki/Scale_ruler

    An architect's scale is a specialized ruler designed to facilitate the drafting and measuring of architectural drawings, such as floor plans and Multi-view orthographic projections. Because the scale of such drawings is often smaller than life-size, an architect's scale features multiple units of length and proportional length increments.

  4. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  5. Emperor of Japan - Wikipedia

    en.wikipedia.org/wiki/Emperor_of_Japan

    The role of the emperor of Japan has historically alternated between a largely ceremonial symbolic role and that of an actual imperial ruler. Since the establishment of the first shogunate in 1192, the emperors of Japan have rarely taken on a role as supreme battlefield commander, unlike many Western monarchs. Japanese emperors have nearly ...

  6. Xerxes I - Wikipedia

    en.wikipedia.org/wiki/Xerxes_I

    Xerxes I (/ ˈ z ɜː r k ˌ s iː z / ZURK-seez [2] [a] c. 518 – August 465 BC), commonly known as Xerxes the Great, [4] was a Persian ruler who served as the fourth King of Kings of the Achaemenid Empire, reigning from 486 BC until his assassination in 465 BC.

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, 1.5 × 30 (which equals 45) will show the same result as 1 500 000 × 0.03 (which equals 45 000). This separate calculation forces the user to keep track of magnitude in short-term memory (which is error-prone), keep notes (which is cumbersome) or reason about it in every step (which distracts from the other calculation requirements).

  8. List of female monarchs - Wikipedia

    en.wikipedia.org/wiki/List_of_female_monarchs

    From 792 she was a co-ruler. Theodora the Armenian (reigned 842–856, disputed) - after the death of her husband she became the co-ruler of her son but in fact she ruled the empire alone; some historians regard her as an empress regnant rather than just a regent; Thekla (reigned 842–856, disputed), co-ruler of Theodora the Armenian

  9. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    The ruler the simplest kind of length measurement tool: lengths are defined by printed marks or engravings on a stick. The metre was initially defined using a ruler before more accurate methods became available. Gauge blocks are a common method for precise measurement or calibration of measurement tools.