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2. Technical drawing tool - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing_tool

   The compass is used to draw arcs and circles. A drawing board was used to hold the drawing media in place; later boards included drafting machines that sped the layout of straight lines and angles. Tools such as templates and lettering guides assisted in the drawing of repetitive elements such as circles, ellipses, schematic symbols and text.

3. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.

4. Point (typography) - Wikipedia

   en.wikipedia.org/wiki/Point_(typography)

   The desktop publishing point (DTP point) or PostScript point is defined as 1 ⁄ 72 or 0.013 8 of the international inch, making it equivalent to 25.4 ⁄ 72 mm = 0.352 7 mm. Twelve points make up a pica, and six picas make an inch.

5. List of centroids - Wikipedia

   en.wikipedia.org/wiki/List_of_centroids

   The following is a list of centroids of various two-dimensional and three-dimensional objects. The centroid of an object in -dimensional space is the intersection of all hyperplanes that divide into two parts of equal moment about the hyperplane.

6. Circular mil - Wikipedia

   en.wikipedia.org/wiki/Circular_mil

   A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It is equal to π /4 square mils or approximately 5.067 × 10 −4 mm 2. It is a unit intended for referring to the area of a wire with a circular cross section.

7. Graduation (scale) - Wikipedia

   en.wikipedia.org/wiki/Graduation_(scale)

   A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.

8. Europe's Maiaspace steps up effort to counter SpaceX with ...

   www.aol.com/news/europes-maiaspace-steps-effort...

   In a discreet forest clearing on a plateau above the town of Vernon in Normandy, France, workers adjust a steel cylinder held under giant red claws - part of a reusable rocket that Europe hopes ...

9. Circle packing in a circle - Wikipedia

   en.wikipedia.org/wiki/Circle_packing_in_a_circle

   Circle packing in a circle is a two-dimensional packing problem with the objective of packing unit circles into the smallest possible larger circle. Table of solutions, 1 ≤ n ≤ 20 [ edit ]