One of the specialized rulers is a shrinkage ruler. That type of ruler is designed for making a wooden mold for a metal slightly bigger that the finished product because of the shrinkage rate of the metal. Rulers don't always measure straight line. Sometimes, like in tailoring industry, it is needed to measure a person waist measurements for example, so there is a folding measurement instrument for that purpose.
There is also a virtual ruler, a ruler software or a screen rulers. It can be used to measure pixels on computers or mobile phones. Contrary to that, there is also a ruler for drawing curved lines. That kind of ruler is known as a French curve. There is also a flexible device known as a flat spline or flexible curve which can be bent into a desirable shape. Home Drawing Tools Ruler.
Measuring Rulers - History, Usage and Types of Rulers A ruler is an instrument that can be used for measuring distances or to draw straight lines in printing, geometry, technical drawing and many other things.
One of the most famous craftsmen of 18 century John Bird, instrument maker once said that there is no mechanical way to produce a straight line. One can only produce an arc of a circle perhaps of a very great diamter , by compass. But I've never heard of this device being used in practice.
Its original purpose was to convert the circular motion to rectilinear motion and back in a steam engine. But the progress is lubricants made this invention redundant for its original purpose. Sign up to join this community. The best answers are voted up and rise to the top.
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See our privacy statement. Skip to main content. Flexible Ruler Invented by Frank G. Usage conditions apply. International Media Interoperability Framework.
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