Clarity is paramount in technical drawing. AS 1100.101-1992 establishes a hierarchy of lines:
The standard defines various line types and widths for use in technical drawings, including: AS 1100.101 1992 Technical drawing General principles.pdf
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The AS 1100 series has deep roots in Australian industry. Its earliest ancestor, , was first published in 1941 and was an endorsement of the engineering drawing practices set by the Institution of Engineers, Australia. Over the following decades, the standard grew into a multi-part series covering everything from general principles to architectural, mechanical and structural drawing. Over the following decades, the standard grew into