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graphometer
graphometer (grəˈfɒmɪtə(r)) Also 8 -metre. [ad. F. graphomètre (1597 in Hatz.-Darm.), f. as prec. + µέτρον measure.] A mathematical instrument, used for measuring angles in surveying; otherwise called a semi-circle. † Also, a goniometer used in crystallography.1696 Phillips, Graphometer. 1712 J. Jam...
Oxford English Dictionary
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Graphometer
The graphometer, semicircle or semicircumferentor is a surveying instrument used for angle measurements. The form was introduced in Philippe Danfrie's (Paris, 1597) and the term graphometer was popular with French geodesists.
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Cochleoid
The American Mathematical Monthly, Vol. 31, No. 5 (May, 1924), pp. 222–227 (JSTOR)
Howard Eves: A Graphometer.
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semicircle
semicircle (ˈsɛmɪsɜːk(ə)l) [ad. L. sēmicirculus: see semi- 7 b and circle n.] 1. The half of a circle divided by a diameter, or the half of its circumference.1526 A C. mery talys 3 b, [Oxford scholar loq.] Cobler I pray the set me .ii. tryangyls & .ii. semy cercles vppon my subpedytals. 1551 Recorde...
Oxford English Dictionary
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Circumferentor
See also
Graphometer
Alidade
References
"Circumferentor". Oxford English Dictionary. Oxford University Press. 2nd edition. 1989.
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graphometric
▪ I. graphoˈmetric, a.1 [f. prec. + -ic.] Pertaining to or ascertained by a graphometer.In mod. Dicts. So graphoˈmetrical a.1 = prec.1828–32 in Webster; and in later Dicts.▪ II. graphoˈmetric, a.2 (n.) Math. [f. grapho- (taken as comb. form of graphic, in sense 5 b) + metric.] Applied by Clifford to...
Oxford English Dictionary
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Philippe Danfrie
He is probably best known as designer of the surveying instrument known as the graphometer.
Danfrie was born in Cornouaille in Brittany.
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Pantometrum Kircherianum
of Pantometrum Kircherianum at the Max Planck Institute Library
digital copy of Pantometrum Kircherianum at the Bayerische Staatsbibliothek
See also
Graphometer
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Theodolite
theodolite, instruments such as the groma, geometric square and the dioptra, and various other graduated circles (see circumferentor) and semicircles (see graphometer The 1728 Cyclopaedia compares "graphometer" to "half-theodolite".
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Alidade
This type of alidade could be found on a plane table, graphometer or similar instrument.
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Jacob's staff
These include:
Cross-head, cross-sight, surveyor's cross or cross
Graphometer
Circumferentor
Holland circle
Miner's dial
Optical square
Surveyor's sextant
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Ioan Mire Melik
Costiescu ("The Graphometer or Campaign Quadrant of the Artillery Colonel A. Costiescu").
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List of measuring instruments
For the ranges of volume-values see: Orders of magnitude (volume)
Angle
Circumferentor
Cross staff
Goniometer
Graphometer
Inclinometer
Mural instrument
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Land registry of Bertier de Sauvigny
To measure angles, other instruments appeared: the planchette bearing an alidade, the graphometer, the theodolite or the quarter-circle.
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