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2. Grade (slope) - Wikipedia

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

   Grade is usually expressed as a percentage - converted to the angle α by taking the inverse tangent of the standard mathematical slope, which is rise / run or the grade / 100. If one looks at red numbers on the chart specifying grade, one can see the quirkiness of using the grade to specify slope; the numbers go from 0 for flat, to 100% at 45 ...

3. Terrace (earthworks) - Wikipedia

   en.wikipedia.org/wiki/Terrace_(earthworks)

   Their designs by various European manufacturers were initially quite simple but effective, allowing them to cross slopes approaching 20%. In the 2000s new designs of wheels and tires, tracks, etc, and incorporation of electronics for better and safer control, allowed these machines to operate on slopes greater than 20% with various implements ...

4. Degree (angle) - Wikipedia

   en.wikipedia.org/wiki/Degree_(angle)

   With the invention of the metric system, based on powers of ten, there was an attempt to replace degrees by decimal "degrees" in France and nearby countries, [note 3] where the number in a right angle is equal to 100 gon with 400 gon in a full circle (1° = 10 ⁄ 9 gon). This was called grade (nouveau) or grad.

5. List of steepest gradients on adhesion railways - Wikipedia

   en.wikipedia.org/wiki/List_of_steepest_gradients...

   1 in 20 (5.0%)/1 in 25 (4.0%) Matheran Hill Railway, India: Near Mumbai: 1 in 21 (4.7%) Saluda Grade, Saluda, North Carolina, United States The steepest standard gauge mainline railroad grade in the United States. [19] Worked by adhesion between 1878 and 2001, currently out of service. 1 in 22 (4.5%) Balsam Mountain Grade, Balsam N.C.

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Van Herick technique - Wikipedia

   en.wikipedia.org/wiki/Van_Herick_technique

   Angle Grade ≥cornea 4 1/4 to 1/2 3 1/4 2 <1/4 1 Slit Dangerously Narrow Table 2 - Van Herick's technique Grading of ... Grade 1 ≈10° Very likely Grade 2 ≈20° ...