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  2. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    10.16 cm = 1.016 dm – 1 hand used in measuring height of horses (4 inches) 12 cm = 1.2 dm – diameter of a compact disc (CD) (= 120 mm) 15 cm = 1.5 dm – length of a Bic pen with cap on; 22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm)

  3. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]

  4. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    A measuring instrument for radio waves: the 64-meter radio telescope at Parkes Observatory, Australia, as seen in 1969, when it was used to receive live televised video from Apollo 11. Considerations related to electric charge dominate electricity and electronics. Electrical charges interact via a field. That field is called electric field.If ...

  5. Moment magnitude scale - Wikipedia

    en.wikipedia.org/wiki/Moment_magnitude_scale

    The formula above made it much easier to estimate the energy-based magnitude M w , but it changed the fundamental nature of the scale into a moment magnitude scale. USGS seismologist Thomas C. Hanks noted that Kanamori's M w scale was very similar to a relationship between M L and M 0 that was reported by Thatcher & Hanks (1973)

  6. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    For example, aligning the rightmost 1 on the C scale with 2 on the LL2 scale, 3 on the C scale lines up with 8 on the LL3 scale. To extract a cube root using a slide rule with only C/D and A/B scales, align 1 on the B cursor with the base number on the A scale (taking care as always to distinguish between the lower and upper halves of the A scale).

  7. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    There are four distinct classes of SSR, each one of them representing a characteristic vertical length scale; the first class includes microrelief variations from individual soil grains to aggregates on the order of 0.053–2.0 mm; the second class consists of variations due to soil clods ranging between 2 and 100 mm; the third class of soil ...

  8. 8 cm PAW 600 - Wikipedia

    en.wikipedia.org/wiki/8_cm_PAW_600

    The HE round, the 8 cm W Gr Patr 5071 with a 4.46 kg projectile and total round weight of 8.30 kg was developed. This could employ three different charge increments for maximum ranges of 3,400 meters @ 220 mps, 5,600 meters @ 320 mps or 6,200 meters at 420 mps - about three times the range of the mortar and with the possibility of direct or ...