It is a precursor to the spirit level and used to establish a vertical or. This plumb line is important for lining up anatomical geometries and visualizing the subject's center of balance. Uses : Plumb Bob, or plummet, is a weight, usually with a pointed tip on the bottom. 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. Bring the string all the way down and let go of the weight. Use a nail or a screw to secure the string of the plumb bob to the uppermost. 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. A plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference. A Complete History of the Plumb Bob and How to Use It 1. 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 A carpenter level is used to check if objects are horizontal or vertical. When the plumb bob is hanging free and not moving, the cord is vertical. The early skyscrapers used heavy plumb bobs, hung on wire in their elevator shafts. Plumb bobs are as simple as they look, too, mainly consisting of a piece of string and a weight as shown below. A plumb bob consists of a piece of metal (called a bob) pointing downwards, which is attached to a cord (see Fig. 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. PLUMB BOB meaning: 1 : a usually small, heavy object that is used to make a string or rope hang straight the heavy object that is part of a plumb line. 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. Precision-turned tip Slack adjuster allows quick changes in cord length Special cavity for cord. A plumb bob and line alone can determine only a vertical reference.
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