The simplest answer is that working to a standard means that anyone can read the drawing.
If there is no standard the symbols used on the drawing (weld type and size, surface finish, even the dimensioning of the components) would vary from one drawing (or draughtsperson) to another and cause confusion.
Engineering drawings use a large number of symbols to denote operations and instructions (which reduces the time taken to draw them and the size of "paper" they're drawn on).
Imagine the potential problems if one person used a symbol to mean "weld" and another one used the same (or similar) symbol to mean "do not weld".
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All the standard books
indian standard plaster
There are college or university courses in graphic engineering. For instance the Camosun College in British Columbia offers a Certificate in Engineering Graphics Technician. Information is also available from Wikipedia, or from your local public library.
There isn't much difference tho but first of all, with regards to the professionals involved... Civil engineering works- qualified civil engineering Building works- quantity surveyor (cost engineer) Will share more soon...
A graphical language used by engineers and other technical personnel associated with the engineering profession. The purpose of engineering drawing is to convey graphically the ideas and information necessary for the construction or analysis of machines, structures, or systems. See alsohttp://www.answers.com/topic/computer-graphics; http://www.answers.com/topic/drafting-2; http://www.answers.com/topic/graphic-methods; http://www.answers.com/topic/schematic-diagram-graphic-arts. The basis for much engineering drawing is http://www.answers.com/topic/orthographic representation (projection). Objects are depicted by front, top, side, auxiliary, or http://www.answers.com/topic/oblique views, or combinations of these. The complexity of an object determines the number of views shown. At times, pictorial views are shown. See alsohttp://www.answers.com/topic/descriptive-geometry; http://www.answers.com/topic/pictorial-drawing. Engineering drawings often include such features as various types of lines, dimensions, lettered notes, sectional views, and symbols. They may be in the form of carefully planned and checked mechanical drawings, or they may be http://www.answers.com/topic/freehand sketches. Usually a sketch precedes the mechanical drawing. Many objects have complicated interior details which cannot be clearly shown by means of front, top, side, or pictorial views. Section views enable the engineer or detailer to show the interior detail in such cases. Features of section drawings are cutting-plane symbols, which show where imaginary cutting planes are passed to produce the sections, and section-lining (sometimes called cross-hatching), which appears in the section view on all portions that have been in contact with the cutting plane. In addition to describing the shape of objects, many drawings must show dimensions, so that workers can build the structure or fabricate parts that will fit together. This is accomplished by placing the required values (measurements) along dimension lines (usually outside the outlines of the object) and by giving additional information in the form of notes which are referenced to the parts in question by angled lines called leaders. Layout drawings of different types are used in different manufacturing fields for various purposes. One is the plant layout drawing, in which the outline of the building, work areas, aisles, and individual items of equipment are all drawn to scale. Another type of layout, or preliminary assembly, drawing is the design layout, which establishes the position and clearance of parts of an assembly. A set of working drawings usually includes detail drawings of all parts and an assembly drawing of the complete unit. Assembly drawings vary somewhat in character according to their use, as design assemblies or layouts; working drawing assemblies; general assemblies; installation assemblies; and check assemblies. Schematic or diagrammatic drawings make use of standard symbols which indicate the direction of flow. In piping and electrical http://www.answers.com/topic/schematic diagrams, symbols are used. The fixtures or components are not labeled in most schematics because the readers usually know what the symbols represent. See alsohttp://www.answers.com/topic/schematic-diagram-graphic-arts; http://www.answers.com/topic/circuit-diagram. Structural drawings include design and working drawings for structures such as building, bridges, dams, tanks, and highways. Such drawings form the basis of legal contracts. Structural drawings http://www.answers.com/topic/embody the same principles as do other engineering drawings, but use terminology and dimensioning techiques different from thoses shown in previous illustrations. See also http://www.answers.com/topic/nomogram.