![]() It is used to measure around a solid body, e.g. ![]() The illustrations on this page show a 2 m (6 ft 7 in) carpenter's rule, which folds down to a length of 25 cm (10 in) to easily fit in a pocket, and a 5 m (16 ft) tape, which retracts into a small housing.Ī flexible length-measuring instrument which is not necessarily straight in use is the tailor's fabric tape measure, a length of tape calibrated in inches and centimeters. When extended for use, they are straight, like a ruler. Measuring instruments similar in function to rulers are made portable by folding (carpenter's folding rule) or retracting into a coil (metal tape measure) when not in use. ![]() More detailed line gauges may contain sample widths of lines, samples of common type in several point sizes, etc. Units of measurement on a basic line gauge usually include inches, agate, picas, and points. These may be made from a variety of materials, typically metal or clear plastic. Practical rulers have distance markings along their edges.Ī line gauge is a type of ruler used in the printing industry. Classically, long measuring rods were used for larger projects, now superseded by tape measure, surveyor's wheel or laser rangefinders.ĭesk rulers are used for three main purposes: to measure, to aid in drawing straight lines, and as a straight guide for cutting and scoring with a blade. Rigid wooden or plastic yardsticks, 1 yard long, and meter sticks, 1 meter long, are also used. Longer rulers, e.g., 18 in (46 cm), are necessary in some cases. Shorter rulers are convenient for keeping in a pocket. 12 in or 30 cm in length is useful for a ruler to be kept on a desk to help in drawing. Metal is used for more durable rulers for use in the workshop sometimes a metal edge is embedded into a wooden desk ruler to preserve the edge when used for straight-line cutting. Historically they were mainly wooden but plastics have also been used since they were invented they can be molded with length markings instead of being scribed. Rulers have long been made from different materials and in multiple sizes. ![]() Since much technical work is now done on computer, many software programs implement virtual rulers to help the user estimate virtual distances. Rulers are ubiquitous in the engineering and construction industries, often in the form of a tape measure, and are used for making and reading technical drawings. At the high school level rulers are often used as straightedges for geometric constructions in Euclidean geometry. Children learn the basic use of rulers at the elementary school level, and they are often part of a student's school supplies. Their ability to quickly and easily measure lengths makes them important in the textile industry and in the retail trade, where lengths of string, fabric, and paper goods can be cut to size. They are important tools in the design and construction of buildings. They are commonly made from metal, wood, fabric, paper, and plastic. Rulers have been used since ancient times. Specialty rulers exist that have flexible edges that retain a chosen shape these find use in sewing, arts, and crafts. Some rulers, such as cloth or paper tape measures, are non-rigid. Commonly the instrument is rigid and the edge itself is a straightedge ("ruled straightedge") which additionally allows one to draw straight lines. A variety of rulers A 2 m (6 ft 6 + 3⁄ 4 in) carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scaleĪ ruler, sometimes called a rule, line gauge, or scale, is an instrument used to make length measurements, whereby a user estimates a length by reading from a series of markings called "rules" along an edge of the device. For the mathematical unfolding problem, see Carpenter's rule problem. HyperSnap > Backgr."Carpenter's rule" redirects here. If you selected a hatch style above, click to select the color for your image workspace background, and for the hatch lines drawn over it. Without this background, you might not be able to differentiate between the window background showing through the image or parts of the image that are the same color as the workspace. such as those in GIF files.ĭifferent hatched backgrounds can help in previewing image transparency.Įxample : Use a hatched background to avoid confusion when viewing at a partially-transparent picture on a solid background. You’ll see this background if the image is too small to fill the space, or if the image has “transparent” areas. Select the style of the HyperSnap workspace background for windows with images. Select where HyperSnap should display an image when it is smaller than the available workspace. You can also position the image in the top left corner or centered within the workspace to have more or less background. (Background is any area that is not the captured image.) This allows you to select the color and hatch pattern for the background in the HyperSnap window.
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