Make sure you allow the plumb bob to hang slightly above the floor, leaving just enough room for it to swing freely. The weight of the bob will force the string into a perfect line this measurement should be taken as a reference point. Partially drive a nail or a screw into the top of the wall or the ceiling about an inch or two from the outside corner of your wall frame. The other end of the string will need to be secured at the reference point you're measuring from onto a nail has been partly driven-in for that purpose of hanging the plumb bob from. If there isn't a string already attached to your plumb bob, you need to fasten one to the top of the tool where you can see a hole in the center of the removable head, unless it is equipped with an eyelet instead at the top into which the string can be tied. If working outside, a heavier bob can help prevent any misreading from breezes. Only use a plumb bob outside when there is little wind, as the slightest breeze could alter the alignment and give you incorrect measurements. If the structure is high enough to need a ladder, make sure your ladder is placed securely on stable ground. It could be helpful to have a range of string lengths to hand in case the structures you are measuring vary in length. If it comes without string, you could try using household cotton string or any string that has no stretch. For use in the home, a bob of between 4 and 10 ounces is advisable. It comes in all weights and sizes, so you will need to pick the most appropriate for your job. Send us feedback.A plumb bob is a weighted metal or brass bulb that hangs from a length of the string. 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. 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. ![]() ![]() 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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