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Secchi disk. The modified Secchi disk design used in fresh water. The Secchi disk (or Secchi disc ), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water.
At the ordinary distance of vision, of from twelve to fifteen inches, circles of confusion are seen as points, if the angle subtended by them does not exceed one minute of arc, or roughly, if they do not exceed the 1/100 of an inch in diameter. Numerically, 1/100 inch at 12–15 inches is closer to two minutes of arc.
Diagram of a circle. This is a w:vector graphics version of w:Image:Circle-1.png which was licensed under the GFDL. Date: 3 December 2005: Source: Own work: Author: en:User:Optimager: Other versions: Derivative works of this file: CIRCLE 1 be-tarask.svg; CIRCLE 1 mk.svg; Circle-withsegments-notext.svg (no text, colour-coded)
The symbol is defined as a circle, with the circular band having a thickness of 10% of the outer diameter of the circle. The inner diagonal line has a thickness of 8% of the outer diameter of the circle (i.e. 80% of the circle's line width). The diagonal is centered in the circle and at a 45-degree angle going from upper left to lower right.
The center of the incircle is a triangle center called the triangle's incenter. [ 1] An excircle or escribed circle[ 2] of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions of the other two. Every triangle has three distinct excircles, each tangent to one of the triangle's sides.
File:Olympic rings without rims.svg. Size of this PNG preview of this SVG file: 342 × 158 pixels. Other resolutions: 320 × 148 pixels | 640 × 296 pixels | 1,024 × 473 pixels | 1,280 × 591 pixels | 2,560 × 1,183 pixels. Original file (SVG file, nominally 342 × 158 pixels, file size: 651 bytes) This is a file from the Wikimedia Commons.
File:Diameter symbol.svg. Size of this PNG preview of this SVG file: 56 × 61 pixels. Other resolutions: 220 × 240 pixels | 441 × 480 pixels | 705 × 768 pixels | 940 × 1,024 pixels | 1,880 × 2,048 pixels. Original file (SVG file, nominally 56 × 61 pixels, file size: 2 KB) This is a file from the Wikimedia Commons.
This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices, sign number M1-5, which states specifically on page I-1 that: Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain .
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