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  2. Grade (climbing) - Wikipedia

    en.wikipedia.org/wiki/Grade_(climbing)

    The American YDS (or 'Yosemite Decimal System') was developed independently by climbers at Tahquitz Peak who adapted the class 5 rating of Sierra Club Class 1–5 system in the 1950s. [4] The class 5 portion of the class scale is a rock climbing classification system, while classes 1–4 are used for hiking and scrambling . [ 4 ]

  3. Yosemite Decimal System - Wikipedia

    en.wikipedia.org/wiki/Yosemite_Decimal_System

    The Yosemite Decimal System (YDS) is a five-part grading system used for rating the difficulty of rock climbing routes in the United States and Canada. [1] It was first devised by members of the Sierra Club in Southern California in the 1950s as a refinement of earlier systems from the 1930s, [ 2 ] and quickly spread throughout North America.

  4. File:Field of View v Magnification chart.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Field_of_View_v...

    Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

  5. Log scaler - Wikipedia

    en.wikipedia.org/wiki/Log_scaler

    Ramp Scale at Mist, Oregon. A log scaling method that has been popular since the adaptation of trucks to haul logs has been the 'ramp scale'. In this approach, the log truck is driven beside a scale ramp which is simply an elevated platform, and from there the log scaler climbs around on the truck and on the load and measures and grades the logs.

  6. Template:Yosemite Decimal System/doc - Wikipedia

    en.wikipedia.org/wiki/Template:Yosemite_Decimal...

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  7. Vertical exaggeration - Wikipedia

    en.wikipedia.org/wiki/Vertical_exaggeration

    The vertical exaggeration is given by: = where VS is the vertical scale and HS is the horizontal scale, both given as representative fractions.. For example, if 1 centimetre (0.39 in) vertically represents 200 metres (660 ft) and 1 centimetre (0.39 in) horizontally represents 4,000 metres (13,000 ft), the vertical exaggeration, 20×, is given by:

  8. Mercator projection - Wikipedia

    en.wikipedia.org/wiki/Mercator_projection

    However, if the map is marked with an accurate and finely spaced latitude scale from which the latitude may be read directly—as is the case for the Mercator 1569 world map (sheets 3, 9, 15) and all subsequent nautical charts—the meridian distance between two latitudes φ 1 and φ 2 is simply

  9. Dynamic similarity (Reynolds and Womersley numbers)

    en.wikipedia.org/wiki/Dynamic_similarity...

    The Reynolds and Womersley Numbers are also used to calculate the thicknesses of the boundary layers that can form from the fluid flow’s viscous effects. The Reynolds number is used to calculate the convective inertial boundary layer thickness that can form, and the Womersley number is used to calculate the transient inertial boundary thickness that can form.