nautical variation-deviation corrector
Datedate 1931
Inventory Number5256
ClassificationNavigational Instrument
Subject
Inventor
Ashley D. Adams
Maker
Boston Yacht Sales, Inc.
Seller
Wilfred O'White
Cultural Region
Place of Origin
Dimensions16.7 × 15 × 0.5 cm (6 9/16 × 5 7/8 × 3/16 in.)
box: 2.7 × 17.1 × 16.9 cm (1 1/16 × 6 3/4 × 6 5/8 in.)
box: 2.7 × 17.1 × 16.9 cm (1 1/16 × 6 3/4 × 6 5/8 in.)
Material
Accessoriesbrass divider with steel tips (now 1997-1-1865); box
DescriptionPlastic (acetate?) disc representing compass card with volvel and index arm. Compass rose card with scale, 0-360 degrees, increases counterclockwise, marked in intervals of 1 degree, labelled every 10 degrees. Cardinal points marked in large block letters. Sylized fleur-de-lys, labelled intercardinal points. Directions on the back of the compass card. Marked on the volvel is a vernier scale, 45-0-45 degrees marked in intervals of 1 degree, labelled every 5 degrees.
Flatwood pine box.
A brass divider with steel tips was included in the box (now 1997-1-1865, kept separate).
Flatwood pine box.
A brass divider with steel tips was included in the box (now 1997-1-1865, kept separate).
Signedprinted in black on instrument: ADAMS / Variation-Deviation / Corrector / COPYRIGHTED / 1931 / by Ashley / D. / Adams
marked on compass rose but covered by the volvel: marked on compass card: WILFRID O. WHITE / Nautical Instruments / Boston, U.S.A. / Pat.Applied For.
InscribedAdams Variation-Deviation Corrector
Curatorial RemarksFormerly DW916.
FunctionTo convert compass readings to true orientation accounting for effects of magnetic variation and deviation. Can also be used to make the inverse conversion.
ProvenanceDavid Wheatland purchased from Wilfred O'White, Boston, 1931. Donated to CHSI April 1977.
Leach Relay Company
Date: 1890-1930
Object number: RS0531
Jacques le Maire
Date: 1738
Accessories: case; plumb bob
Object number: 7416
Philippe Papillon
Date: date 1629
Accessories: None.
Object number: 7928
Ernst Leitz (company)
Date: circa 1937
Accessories: standard eyepieces (3): 8X P, Periplan. OK 10X, and Periplan. Ok. 25X; wide eyepieces (3): 1, 1, 8X, 10X; objectives (4) in fitted case: 1b 4.3X, 3 10X, P7 62X, P 1/12 oel; waveplates (2); condenser with polarizer; mechanical stage; loupe 6x; box of cover glasses; standing case; key; objective adaptors (4); and watch keys (2)
Object number: 1999-1-0020a
Francois Laurier
Date: 1654-1663
Accessories: Original black leather covered, chamois lined fitted case.
Object number: 7415
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
Walter Balcke
Date: 1952-1964
Accessories: mahogany box; cardboard instruction card
Object number: 1997-1-1601
See also/See also
