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A 19th century architect at the drawing board. A drawing board (also drawing table, drafting table or architect's table) is, in its antique form, a kind of multipurpose desk which can be used for any kind of drawing, writing or impromptu sketching on a large sheet of paper or for reading a large format book or other oversized document or for drafting precise technical illustrations (such as ...
Although the most common types of self-healing materials are polymers or elastomers, self-healing covers all classes of materials, including metals, ceramics, and cementitious materials. Healing mechanisms vary from an instrinsic repair of the material to the addition of a repair agent contained in a microscopic vessel.
Tests of the catalyst-free self-healing system have restored up to 82% of the fracture’s strength. [18] Both approaches are examples of autonomous self-healing, in which the repair mechanism is triggered by the occurrence of damage. Materials that autonomously self-repair can retain their structural integrity under stress and last longer. [18 ...
Traditional drafter at work A drafter in Portugal in the 1970s, using a drafting machine. A drafter (also draughtsman / draughtswoman in British and Commonwealth English, draftsman / draftswoman, drafting technician, or CAD technician in American and Canadian English) is an engineering technician who makes detailed technical drawings or CAD designs for machinery, buildings, electronics ...
IEC standards cover a vast range of technologies within electrotechnology. The numbers of older IEC standards were converted in 1997 by adding 60000; for example IEC 27 became IEC 60027. IEC standards often have multiple sub-part documents; only the main title for the standard is listed here. IEC 60027 Letter symbols to be used in electrical ...
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A Computervision Inc. CADDS3 system being used to create a piping and instrumentation diagram in a training lab, circa 1979. Computervision's first product, CADDS-1, was aimed at the printed circuit board layout and 2-D drafting markets. CADDS stood for Computervison Automated Design and Drafting System.
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