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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 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]
Pages for logged out editors learn more. Contributions; ... Print/export Download as PDF; ... Pages in category "Rulers"
Pages for logged out editors learn more. Contributions; ... Print/export Download as PDF; ... Pages in category "Lists of rulers"
The union was founded in 1921 as the National Union of Printing, Bookbinding, Machine Ruling and Paper Workers when the National Union of Bookbinders and Machine Rulers and the National Union of Printing and Paper Workers merged. The Platen Printing Machine Minders' Society and the London Society of Machine Rulers soon also joined.