This plumb line is important for lining up anatomical geometries and visualizing the subject's center of balance. Since the Egyptians understood the isosceles triangle, stones could be cut and chiseled square, then mortared into place using this instrument for precision. The cord with the plumb bob was draped over the bottom shelf, and if the surface was vertical, then the cord would just touch the shelf’s outer edge. To use the plumb rule, the back of the plank was pressed against a surface with the end bearing the attached cord and shelves oriented upward. The device used may be purpose-made plumb lines, or simply makeshift devices made from a piece of string and a weighted object, such as a metal washer. The second type of level was an A-frame with a plumb bob suspended from the apex. A plumb bob was suspended from the cord’s other end. ![]() ![]() Students of figure drawing will also make use of a plumb line to find the vertical axis through the center of gravity of their subject and lay it down on paper as a point of reference. Ī plumb bob may be in a container of water (when conditions are above freezing temperatures), molasses, very viscous oils or other liquids to dampen any swinging movement, functioning as a shock absorber.ĭetermining center of gravity of an irregular shape The early skyscrapers used heavy plumb bobs, hung on wire in their elevator shafts. A variation of this tool has the plumb line hung from the top of an inverted T shape. An A-frame level with a plumb line hung from the vertex was also used to find horizontal these were used in Europe until the mid–19th century. However, if they are mounted on a suitable scale the instrument may also be used as an inclinometer to measure angles to the vertical.Īncient Egyptians used a plumb line attached to the top outer part of a tool resembling a letter E when placed against a wall, the plumb line would indicate a vertical line. ![]() A plumb bob and line alone can determine only a vertical reference. The Mets collection of ancient Egyptian art consists of approximately 26,000 objects of artistic, historical, and cultural importance, dating from the.
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