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The square has many uses, including laying out common rafters, hip rafters and stairs. [1] It has a diagonal scale, board foot scale and an octagonal scale. On the newer framing squares there are degree conversions for different pitches and fractional equivalents. Framing squares may also be used as winding sticks.
Japan's Hi-Vision originally started with a 5:3 (= 15:9) ratio but converted when the international standards group introduced a wider ratio of 5 + 1 ⁄ 3 to 3 (= 16:9). Many digital video cameras have the capability to record in 16:9 (= 4 2 :3 2 ), and 16:9 is the only widescreen aspect ratio natively supported by the DVD standard.
Framing square, or steel square, or carpenter's square, or roofing square Originally designed for timber framing, a framing square is made from a single flat piece of metal or polymer to a standardised design with a long, wide blade and at 90° to that a shorter, narrower tongue. It can also be used for measuring lengths and for calculating angles.
The term "SmileBox" is a registered trademark [4] used to describe a type of letter-boxing for Cinerama films, such as on the Blu-ray release of How the West Was Won. The image is produced by using a map projection-like technique to approximate how the picture might look if projected onto a curved Cinerama screen. [5]
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Common lines made using a speed square include perpendicular cut marks and Angles definition of an angle for roofs, stairways, and decks. The tool uses a 0° reference. This means when a board is squared off the tool reads 0°. The angle derived is actually a complementary angle, for example a 22.5° angle is actually 67.5°. The sum of the ...
[4] [2] The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°. When attached one face is parallel to the rule, one face is perpendicular, and one face is at 45°. The standard head usually incorporates a small spirit level and a small removable scriber. [4]