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Various scales may be used for different drawings in a set. For example, a floor plan may be drawn at 1:50 (1:48 or 1 ⁄ 4 ″ = 1′ 0″) whereas a detailed view may be drawn at 1:25 (1:24 or 1 ⁄ 2 ″ = 1′ 0″). Site plans are often drawn at 1:200 or 1:100. Scale is a nuanced subject in the use of engineering drawings.
One review of tall buildings suggests that residential towers may have 3.1 m (10 ft 2 in) floor height for apartments, while a commercial building may have floor height of 3.9 m (12 ft 9.5 in) for the storeys leased to tenants. In such tall buildings (60 or more storeys), there may be utility floors of greater height. [7]
An octavo page, oriented a quarter turn from the full sheet, would have height 240 mm (9 + 1 ⁄ 2 in)— 1 ⁄ 2 in × 19 —and width 160 mm (6 + 1 ⁄ 4 in)— 1 ⁄ 4 in × 25. The sizes of books of the same format will differ in proportion to the full sheets used to print them.
ISO Standards Handbook – Technical drawings, a broad collection of all basic ISO drawing standards Vol.1 Technical drawings in general, ISBN 92-67-10370-9; Vol.2 Mechanical engineering drawings, construction drawings, drawing equipment, ISBN 92-67-10371-7; ISO 128 Technical drawings—General principles of presentation
By rotating the cube by 45° on the x-axis, the point (1, 1, 1) will therefore become (1, 0, √ 2) as depicted in the diagram. The second rotation aims to bring the same point on the positive z -axis and so needs to perform a rotation of value equal to the arctangent of 1 ⁄ √ 2 which is approximately 35.264°.
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Third-angle projection is most commonly used in America, [6] Japan (in JIS B 0001：2010); [7] and is preferred in Australia, as laid down in AS 1100.101—1992 6.3.3. [8] In the UK, BS8888 9.7.2.1 allows for three different conventions for arranging views: Labelled Views, Third Angle Projection, and First Angle Projection.
Technical Drawing 13th Edition. Prentice Hall. ISBN 978-0-13-513527-3. "Leroy Lettering & Lettering Templates/Guides". Archived from the original on 2010-09-13; Engineering Drawing Practice for Schools and Colleges: SP46(Bureau of Indian Standards) A textbook of freehand lettering by Daniels, Frank Thomas 1865