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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]
A rolling ruler is a ruler that contains a cylinder much like a rolling pin inside, thereby enabling it to "roll" along a sheet of paper or other surface where it is being used. A rolling ruler can draw straight, parallel lines, and also has other instruments included, enabling it to do the jobs of a protractor and compass .
Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.
C. A. Nothnagle Log House, built in New Jersey circa 1640, is likely the oldest log cabin in the United States. Pre-fabricated log houses for export were manufactured in Norway from the 1880s until around 1920 by three large companies: Jacob Digre in Trondheim, M. Thams & Co. in Orkanger, and Strømmen Trævarefabrik at Strømmen. They were ...
Wonky is a subgenre of electronic dance music known primarily for its off-kilter or "unstable" beats, as well as its eclectic, colorful blend of genres including hip-hop, electro-funk, 8-bit, jazz fusion, glitch, and crunk. [1] [2] Artists associated with the style include Joker, Rustie, Hudson Mohawke, Zomby, and Flying Lotus.
Recreation of a cabin in which soldiers would have lived at Valley Forge. Throughout the park there are reconstructed log cabins of the type thought to be used during the encampment. Earthworks are visible for the defense of the encampment, including four redoubts, the ditch for the Inner Line Defenses, and a reconstructed abatis.
An adjustable square also includes a ruler. A speed square can mark 90 and 45-degree fixed angles and any angle between 0 and 90 degrees using its long axis. [20] Tape measure Tape measure: A tape measure is a retractable or flexible ruler that has measurement increments as small as 1/32" or 1 millimetre. Handsaw Three old handsaws