Plumb bob string4/20/2023 This plumb line is important for lining up anatomical geometries and visualizing the subject's center of balance. 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. If you put a double knot on the end of the cord and pull it taught, you can now use your plumb bob. Excavation and foundation contractors rely upon the plumb. The plumb bob has no problem other than it looks its age, a few nicks, a few rust spots. How to thread the string into you plumb bob Mavis Williams from UNITED KINGDOM says Hi, to attach the thread to the plumb bob you need to thread the cord through the central top hole so that it comes out of the side hole underneath the knurled head. The removable cap allows you to install string or line quickly and easily, while the hardened. Great for surveyors for lining up points or transferring them. 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. Find plumb quickly and easily with Johnsons plumb bobs. The early skyscrapers used heavy plumb bobs, hung on wire in their elevator shafts.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 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. A plumb bob, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or 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. Send us feedback.A plumb bob and line alone can determine only a vertical reference. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'plumb bob.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2018 Cake pans, coffee pots, cash registers, and a white ElectroChef stove appeared amid scientific instruments such as steel calipers and a brass plumb bob. Rhett Allain, WIRED, Accurate to within 1/4 of an inch per 100 feet of range, the kit comes with a tripod with quick-adjust legs, a heavy-duty 8-foot aluminum grade rod (feet-inches-eighths), a plumb bob, and a kit box to safeguard the laser during transport.ĭavid Grossman, Popular Mechanics, 17 Jan. 2019 The plumb bob will hang at the angle reading for your latitude. 2020 For a long time, the tools used to measure medieval buildings were nearly as old as the buildings themselves: plumb bobs, string, rulers, and pencils.Īndrew Tallon, National Geographic, 16 Apr. Ryan D'agostino, Popular Mechanics, 24 Oct. Some are bullet- or cone-shaped, but in the DIY world they're often in the guise of a chalk box or chalk line. That weighted object can be as simple as a rock or as elaborate as the brass plumb bob shown. 2022 For holes deeper than three feet, drop a plumb bob (a conical weight attached to a string) into it to give you some sense whether the hole itself is plumb and uniformly shaped. What is a brass plumb bob used for A plumb bob is a weighted object connected to a string that can be used to establish a vertical line. Jennifer Ouellette, Ars Technica, Where many competitors use surveying equipment that’s accurate to within a thousandth of a degree to orient their robots on startup, Coordinated often relies on a plumb bob (cost: a few bucks). Recent Examples on the Web Possible uses included: a plumb bob or a loom weight, a liquid sprinkler, a fire starter, a lamp, a smoking pipe, or parts of an apparatus for distillation.
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