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This triangle is also called a drafting triangle, hence the name. [1] This triangle is also half of an equilateral triangle , and a polydrafter's cells must consist of halves of triangles in the triangular tiling of the plane; consequently, when two drafters share an edge that is the middle of their three edge lengths, they must be reflections ...
Engineering Drawing by Thomas Ewing French (1871-1944), Mech. Eng., OSU 1895, also known as A Manual of Engineering Drawing for Students and Draftsman, was first published in 1911 by McGraw-Hill Book Company. It appeared in fourteen editions and was last published in 1993. The title and author remained the same through the first six editions.
A drafting machine is a tool used in technical drawing, consisting of a pair of scales mounted to form a right angle on an articulated protractor head that allows an angular rotation. [ 1 ] [ 2 ] The protractor head (two scales and protractor mechanism) is able to move freely across the surface of the drawing board , sliding on two guides ...
Drafting or draughting may refer to: Campdrafting, an Australian equestrian sport; Drafting (aerodynamics), slipstreaming; Drafting (writing), writing something that is likely to be amended; Technical drawing, the act and discipline of composing diagrams that communicates how something functions or is to be constructed. E.g.: Architectural drawing
The drawing head of a track-type drafting machine slides on bearings in a vertical rail, which in turn is moved along a horizontal, top-mounted rail. Both apparatus types have an adjustable drawing-head with rules attached to a protractor scale so that the angle of the rules may be adjusted.
Twelve key lengths of a triangle are the three side lengths, the three altitudes, the three medians, and the three angle bisectors. Together with the three angles, these give 95 distinct combinations, 63 of which give rise to a constructible triangle, 30 of which do not, and two of which are underdefined. [13]: pp. 201–203
T-Square is a small part of the reason people use today's computers for drafting, architecture, drawing and illustration and engineering. Prior to this revolution and in some places to this day, draftsmen and women used triangles , wood or metal T-squares , pencils and technical pens on film and paper .
In January 2012, the company entered administration. On 8 February 2012 the company stated, "The joint administrators from Grant Thornton UK LLP are currently speaking to a number of interested parties and have received offers for the sale of the business as a going concern." [2] One week later, the company was bought by the French Maped group. [3]