Carangeot-type contact goniometer
Datecirca 1830
Inventory Number2017
ClassificationGoniometer
Subject
Maker
Pixii
fl. 1818 - 1855
Cultural Region
Place of Origin
Dimensionsgoniometer: 1.6 × 10.4 × 5.5 cm (5/8 × 4 1/8 × 2 3/16 in.)
case: 2.2 × 12.3 × 6.6 cm (7/8 × 4 13/16 × 2 5/8 in.)
case: 2.2 × 12.3 × 6.6 cm (7/8 × 4 13/16 × 2 5/8 in.)
Material
DescriptionThis Carangeot-type goniometer consists of a graduated semicircular arc whose diameter also serves as the stationary measuring limb; the left end of the diameter is not connected to the arc. The second limb rotates around the center of the circle. Both limbs are equipped with internal slots, so that the pointed ends can be appropriately shortened or lengthened through parallel sliding. A hinge at the center of the arc increases the versatility of the device, while an extra radial arm mounted behind the 140° mark gives it greater stability.
The goniometer is preserved in its original brown leather-covered, green satin and velvet-lined wood case.
The goniometer is preserved in its original brown leather-covered, green satin and velvet-lined wood case.
SignedEngraved on the back: Pixii à Paris
Curatorial RemarksAccording to card, this object was formerly numbered DW0279. A different object now has that number.
FunctionThe purpose of crystallographic goniometry is to measure the interfacial angles of crystals to determine their type.
To determine the angle between two surfaces, one has to hold the crystal edge at the scissor opening between the limbs of the goniometer. The angle being measured is read from the scale. Such contact goniometers usually have an accuracy between 15 minutes and 1 degree.
To determine the angle between two surfaces, one has to hold the crystal edge at the scissor opening between the limbs of the goniometer. The angle being measured is read from the scale. Such contact goniometers usually have an accuracy between 15 minutes and 1 degree.
ProvenanceDavid P. Wheatland purchased from F. & G. Staack, Camden, Maine, June 20, 1959. Donated to CHSI December 1963.
W. & S. Jones
Date: circa 1797
Accessories: original case
Object number: 1999-1-0034
Rudolf Fuess
Date: circa 1875
Accessories: case
Object number: 1997-1-1740
Keuffel & Esser Company
Date: circa 1910
Accessories: case
Object number: 1997-1-1750
Johann August Oertling
Date: circa 1860
Accessories: box of crystal holders (2007b)
Object number: 2007a
Johann August Oertling
Date: circa 1860
Object number: 2002
Rudolf Fuess
Date: circa 1900
Accessories: wooden case; xeroxed article from Crystallography, N. Story-Maskelyne, Oxford 1898, p. 394-399, [The morphology of crystals] (describes in detail the use of the instrument); Stereo photograph of some experimental arrangement, perhaps a spectrometer; Spectrum photograph of Fluorit, signed "Victor Schumann, Leipzig 1901"
Object number: 1997-1-1752
Rudolf Fuess
Date: circa 1900
Object number: 1997-1-1731
Peter Stoe
Date: circa 1896
Accessories: quartz crystal (mounted on wax)
Object number: 1997-1-1739
See also/See also
