planimetern.

Brit.

/plaˈnɪmᵻtə/,

/pləˈnɪmᵻtə/, U.S.

/pləˈnɪmədər/

Forms: 1800s planimetre, 1800s– planimeter.

Origin: Formed within English, by compounding. Etymons: plani- comb. form, -meter comb. form².

Etymology: < plani- comb. form + -meter comb. form². In sense 1 after altimeter n. In sense 2 after German Planimeter (1824 or earlier).An instrument of this name (apparently a kind of cartographic tool) was apparently first described by L. Hulsius (1550–1606), Dutch writer and dealer in mechanical instruments: post-classical Latin planimetrum (1605), planimeter (1604; also in a German context as planimetra ). Compare also French planimètre instrument for measuring the area of a horizontal plane (1812). Instruments of the kind denoted by sense 2 were developed in the first half of the 19th cent.; quot. 1872 at sense 2 refers to the instrument invented by J. Amsler (1823–1912), Swiss engineer, in 1854 and first described in print slightly later ( J. Amsler Über die mechanische Bestimmung des Flächeninhaltes,..insbesondere über einen neuen Planimeter 1856 ).

†1. An optical instrument for measuring angles in a horizontal plane. Obsolete. rare.

ΚΠ

1852 W. Beschke Mem. U.S. Congr. & Govt. 56 Instead of being ‘altimeters’, to measure vertical angles, our telescopes must be planimeters, to measure horizontal angles.

2. An instrument with a movable pointer used for mechanical measurement of the area of an (irregular) plane figure. Cf. platometer n.

ΘΚΠ

the world > relative properties > measurement > measuring instrument > [noun] > for measuring area

platometer1852

planimeter1858

1858 P. L. Simmonds Dict. Trade Products 291/1 Planimeter, an instrument for calculating the area of plane figures.

1872 F. J. Bramwell in Rep. Brit. Assoc. 401 Amsler's Planimeter..for measuring the area of any figure, however irregular, by the mere passage of a tracer round about its perimeter.

1875 C. Darwin Insectivorous Plants xv. 355 The area of all the leaves together with their footstalks, was found by a planimetre.

1949 A. C. Walshaw Heat Engines (ed. 3) iii. 66 One of three ways is usually adopted for finding the mean effective pressure of an indicator diagram, namely: (i) Measuring the area of the diagram by means of a planimeter and dividing it by the length of the diagram, then multiplying this mean height by the strength of the indicator spring [etc.].

1989 Jrnl. Zool. 219 5 The most peripheral locations of an animal were connected by straight lines and the area thus enclosed was measured by a compensating planimeter.

2004 Ottawa Citizen (Nexis) 20 May e2 He got the original idea from..seeing a gadget called a planimeter, which can plot the area under a very irregular-shaped figure.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2022).

单词	planimeter
释义	planimetern. Brit. /plaˈnɪmᵻtə/, /pləˈnɪmᵻtə/, U.S. /pləˈnɪmədər/ Forms: 1800s planimetre, 1800s– planimeter. Origin: Formed within English, by compounding. Etymons: plani- comb. form, -meter comb. form². Etymology: < plani- comb. form + -meter comb. form². In sense 1 after altimeter n. In sense 2 after German Planimeter (1824 or earlier).An instrument of this name (apparently a kind of cartographic tool) was apparently first described by L. Hulsius (1550–1606), Dutch writer and dealer in mechanical instruments: post-classical Latin planimetrum (1605), planimeter (1604; also in a German context as planimetra ). Compare also French planimètre instrument for measuring the area of a horizontal plane (1812). Instruments of the kind denoted by sense 2 were developed in the first half of the 19th cent.; quot. 1872 at sense 2 refers to the instrument invented by J. Amsler (1823–1912), Swiss engineer, in 1854 and first described in print slightly later ( J. Amsler Über die mechanische Bestimmung des Flächeninhaltes,..insbesondere über einen neuen Planimeter 1856 ). †1. An optical instrument for measuring angles in a horizontal plane. Obsolete. rare. ΚΠ 1852 W. Beschke Mem. U.S. Congr. & Govt. 56 Instead of being ‘altimeters’, to measure vertical angles, our telescopes must be planimeters, to measure horizontal angles. 2. An instrument with a movable pointer used for mechanical measurement of the area of an (irregular) plane figure. Cf. platometer n. ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > for measuring area platometer1852 planimeter1858 1858 P. L. Simmonds Dict. Trade Products 291/1 Planimeter, an instrument for calculating the area of plane figures. 1872 F. J. Bramwell in Rep. Brit. Assoc. 401 Amsler's Planimeter..for measuring the area of any figure, however irregular, by the mere passage of a tracer round about its perimeter. 1875 C. Darwin Insectivorous Plants xv. 355 The area of all the leaves together with their footstalks, was found by a planimetre. 1949 A. C. Walshaw Heat Engines (ed. 3) iii. 66 One of three ways is usually adopted for finding the mean effective pressure of an indicator diagram, namely: (i) Measuring the area of the diagram by means of a planimeter and dividing it by the length of the diagram, then multiplying this mean height by the strength of the indicator spring [etc.]. 1989 Jrnl. Zool. 219 5 The most peripheral locations of an animal were connected by straight lines and the area thus enclosed was measured by a compensating planimeter. 2004 Ottawa Citizen (Nexis) 20 May e2 He got the original idea from..seeing a gadget called a planimeter, which can plot the area under a very irregular-shaped figure. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2022). < n.1852
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