sector
Datecirca 1690
Inventory NumberDW0951
ClassificationSector
Subject
Maker
John Worgan
fl. 1682 - 1700
Cultural Region
Place of Origin
Dimensionsclosed: 0.5 x 32.3 x 5.8 cm (3/16 x 12 11/16 x 2 5/16 in.)
Material
DescriptionEnglish sector is made of brass and engraved with the following scales:
side a:
line of chords ("Cho")
line of natural secants ("sec")
line of lines ("Lin"), also known as line of equal parts
line of polygons ("Pol")
Gunter's line of numbers ("Num")
side b:
line of natural tangents ("Tan")
small line of natural tangents ("tan")
line of natural sines ("Sin")
line of artificial sines ("Sin")
line of artificial tangents ("Tan")
along outer edges of arms:
scale of inches ("Inch")
The sector hinge is round and plain except for the maker's signature.
side a:
line of chords ("Cho")
line of natural secants ("sec")
line of lines ("Lin"), also known as line of equal parts
line of polygons ("Pol")
Gunter's line of numbers ("Num")
side b:
line of natural tangents ("Tan")
small line of natural tangents ("tan")
line of natural sines ("Sin")
line of artificial sines ("Sin")
line of artificial tangents ("Tan")
along outer edges of arms:
scale of inches ("Inch")
The sector hinge is round and plain except for the maker's signature.
Signedon hinge: I: Worgan fecit.
Curatorial RemarksXRF analysis of the metals was done by Katherine Eremin and Sara Schechner in August 2007.
FunctionCalculation
ProvenanceDavid Wheatland purchased from Sotheby's, London, July 15, 1963 (lot 134), via Ernst Weil. Donated to CHSI 1985.
English
Date: 1775-1800
Accessories: case contains the following nine instruments: one ivory and brass sector; one ivory and brass parallel rule; one brass protractor; two pairs of dividers, one with pen holder, pencil holder, and inking wheel (for drawing dotted line) attachments; and pen.
Object number: 5458
George Adams (I)
Date: circa 1766
Accessories: original case
Object number: DW0955
Gilson Slide Rule Company
Date: 1915-1919
Object number: 1989-1-0006
Tavella Sales Company
Date: copyright 1934
Accessories: black leather case with snap closure, instruction manual (in file)
Object number: 2003-1-0244