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A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
[12] In 1871, Justus Roe introduced a cost cutting technique to the tape measure. [14] Employing rivets to attach small brass washers to the tape, he could mark inches and feet. To further enhance readability, small brass tags were affixed at five-foot intervals, each bearing a number indicating the total number of feet to that point. [15]
However, 12 Fournier points turned out to be 11 Didot points, [11]: 142–145 giving a Fournier point of about 0.345 mm; later sources [12]: 60–61 state it as being 0.348 75 mm. To avoid confusion between the new and the old sizes, Didot also rejected the traditional names, thus parisienne became corps 5, nonpareille became corps 6, and so on.
A standard ruler is an astronomical object for which the actual physical size is known. By measuring its angular size in the sky, one can use simple trigonometry to determine its distance from Earth. In simple terms, this is because objects of a fixed size appear smaller the further away they are.
The apparent PPI of a monitor depends upon the screen resolution (that is, the number of pixels) and the size of the screen in use; a monitor in 800×600 mode has a lower PPI than does the same monitor in a 1024×768 or 1280×960 mode. The dot pitch of a computer display determines the absolute limit of possible pixel density.