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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 .
Each ruler's scale has graduations labeled with precomputed outputs of various mathematical functions, acting as a lookup table that maps from position on the ruler as each function's input. Calculations that can be reduced to simple addition or subtraction using those precomputed functions can be solved by aligning the two rulers and reading ...
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]
Hand quilting is the process of using a needle and thread to sew a running stitch by hand across the entire area to be quilted. This binds the layers together. A quilting frame or hoop is often used to assist in holding the piece being quilted off the quilter's lap.
An agate or ruby is a unit of typographical measure. It is 5.5 typographical points, or about 1 ⁄ 13 inch (1.94 mm). It can refer either to the height of a line of type or to a font that is 5.5 points.
Whole-cloth quilt, 18th century, Netherlands.Textile made in India. In Europe, quilting appears to have been introduced by Crusaders in the 12th century (Colby 1971) in the form of the aketon or gambeson, a quilted garment worn under armour which later developed into the doublet, which remained an essential part of fashionable men's clothing for 300 years until the early 1600s.