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plumb-line

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plumb-line
plumb-line, n. (ˈplʌmlaɪn) Also 7 plim-. 1. A line or cord having at one end a metal bob or plummet, for testing or determining vertical direction; sometimes = plumb-rule.1538 Elyot Dict. Perpendiculum, a plumlyne, such as masons and carpenters haue, with leadde at the ende. 1609 Bible (Douay) Isa. ... Oxford English Dictionary
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plumb-line
plumb-linen line with a plumb(1) attached to one end 铅垂线. 牛津英汉双解词典
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Horopter
Other criteria used over the years include the apparent fronto-parallel plane horopter, the equi-distance horopter, the drop-test horopter or the plumb-line wikipedia.org
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John MacCulloch
for a repetition of the pendulum experiments previously conducted by Nevil Maskelyne and John Playfair at Schiehallion, and on the deviations of the plumb-line wikipedia.org
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spad
spad1 orig. U.S. (spæd) [Var. of spud n.] A spike with a flattened end containing a hole to support a plumb-line, so that it can be driven into a tunnel roof to provide a marker.1908 L. W. Trumbull Man. Underground Surveying iii. 93 A majority of the mines of the United States are using punched hors... Oxford English Dictionary
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Groma (surveying)
Also, the far plumb-line on the cross is optically thinner than the closer one, introducing the angle error calculated by the archeologists to be about wikipedia.org
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plummet
plummet/ˈplʌmɪt; `plʌmɪt/ n1 (weight attached to a) plumb-line 测深锤; 铅锤; 铅垂线.2 weight attached to a fishing-line to keep the float upright （钓丝上的）铅坠, 坠子（用以使鱼漂竖起）. plummet, v [I, Ipr, Ip]fall steeply or rapidly 大坡度或快速落下 House prices have plummeted in this area. 此地房价大跌. Pieces of rock plummeted down the... 牛津英汉双解词典
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Ernst Friedrich Knorre
With the help of little more than a plumb-line and bob, he fixed four plates with a series of round holes atop the wall of the two-story home where he wikipedia.org
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perpendicle
† perˈpendicle Obs. rare. [a. OF. perpendicle (14th c. in Hatz.-Darm.), ad. L. perpendiculum plummet, plumb-line, f. *perpendēre, f. per- 2 + pendēre to hang. Cf. mod.F. perpendicule (16th c.), It. perpendicolo.] A plumb-line.14.. in Halliwell Rara Math. (1841) 58 Come toward and go froward til þe p... Oxford English Dictionary
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Francis Cunningham (painter)
high school scholarship class at BMAS came to be known for its nontraditional methods of figurative painting, observing directly from nature using a plumb-line wikipedia.org
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adjustable
adjustable, a. (əˈdʒʌstəb(ə)l) [f. adjust + -able.] Capable of being adjusted. adjustable pitch: freq. attrib. (with hyphen), applied to an aeroplane propeller the blade angle of which can be adjusted when the engine is at rest (opp. variable pitch). Also absol., a pitch setting capable of such adju... Oxford English Dictionary
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Floating collimator
His collimator was meant to replace a level, or plumb-line, in astronomical observations, and to provide a ready and perfectly exact method of determining wikipedia.org
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plumb
plumb/plʌm; plʌm/ n1 piece of lead that is tied to a cord and used to find the depth of water or test whether a wall, etc is vertical 测深锤, 铅锤（悬挂於绳上的铅块, 用以测水深或墙等是否垂直）.2 (idm 习语) out of `plumb not vertical 不垂直的. plumb, adv1 exactly 恰恰; 正: plumb in the centre 在正中.2 (US infml 口) quite; absolutely 十分; 完全... 牛津英汉双解词典
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Giovanni Battista Guglielmini
Sixteen balls were dropped from a height of 241 feet, between June and September, 1791, and the plumb-line fixed in February, 1792, all during the night In spite of their agreement both observation and calculation were defective, the plumb-line having been determined half a year later, and the theory of wikipedia.org
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Geopotential
Many observable quantities of the gravity field, such as gravity anomalies and deflections of the vertical (plumb-line), can be expressed in this disturbing wikipedia.org
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