单词	plumb bob
释义	plumb bob noun : the metal bob of a plumb line Example Sentences 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. Jennifer Ouellette, Ars Technica, 3 May 2022 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). Tom Vanderbilt, Wired, 1 Feb. 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. Ryan D'agostino, Popular Mechanics, 24 Oct. 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. Andrew Tallon, National Geographic, 16 Apr. 2019 The plumb bob will hang at the angle reading for your latitude. Rhett Allain, WIRED, 3 May 2018 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. David Grossman, Popular Mechanics, 17 Jan. 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. Jason Farago, New York Times, 7 Sep. 2017 See More Word History First Known Use 1836, in the meaning defined above
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