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Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones . By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations .
A Golomb ruler of order m with length n may be optimal in either of two respects: [11]: 237 . It may be optimally dense, exhibiting maximal m for the specific value of n,; It may be optimally short, exhibiting minimal n for the specific value of m.
DABACABA patterns in (3-bit) binary numbersThe ABACABA pattern is a recursive fractal pattern that shows up in many places in the real world (such as in geometry, art, music, poetry, number systems, literature and higher dimensions).
The Bosporan kings were the rulers of the Bosporan Kingdom, an ancient Hellenistic Greco-Scythian state centered on the Kerch Strait (the Cimmerian Bosporus) and ruled from the city of Panticapaeum. Panticapaeum was founded in the 7th or 6th century BC; the earliest known king of the Bosporus is Archaeanax , who seized control of the city c ...
To measure a length of 7, say, with this ruler one would take the distance between the marks at 6 and 13. A Golomb ruler is a sparse ruler that requires all of the differences a j − a i {\displaystyle a_{j}-a_{i}} be distinct.
A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.
A ruler with two linear scales: the metric and imperial.It includes shorter minor graduations and longer major graduations. A graduation is a marking used to indicate points on a visual scale, which can be present on a container, a measuring device, or the axes of a line plot, usually one of many along a line or curve, each in the form of short line segments perpendicular to the line or curve.
The second, outer, cylinder is printed with the slide rule's primary logarithmic scale in the form of a 50-turn helix 12.70 metres; 500 inches (41 ft 8 in) long with annotations on the scale going from 100 to 1000. A brass tube with a mahogany cap at the top is a slide fit into the first cylinder. [1] [2] [3] [4]