navigator's protractor
Datecirca 1950
Inventory Number2007-1-0177
ClassificationProtractor
Subject
Maker
American
Cultural Region
Dimensions12.3 × 12.3 × 0.1 cm (4 13/16 × 4 13/16 × 1/16 in.)
Material
DescriptionThis is a navigator's protractor printed in red ink on a square piece of clear plastic. The plastic is discolored to a yellow shade and is distorted from age.
One edge is graduated with a scale of 8 miles per inch, marked 0-39. The opposite edge is graduated in millimeters 1-120 mm.
The protractor in the center has a wind rose marked with the initials of the cardinal points in English and numerals [0]-3-33-[36]. Around the limb there is an azimuth circle divided 0° - 360° every 1° running in both directions.
One edge is graduated with a scale of 8 miles per inch, marked 0-39. The opposite edge is graduated in millimeters 1-120 mm.
The protractor in the center has a wind rose marked with the initials of the cardinal points in English and numerals [0]-3-33-[36]. Around the limb there is an azimuth circle divided 0° - 360° every 1° running in both directions.
Signedunsigned
Inscribedon upper left: SCALE: 8 MILES = 1 INCH / 1 : 500 000
on lower right: METRIC
scratched into plastic on lower left: HU4302
FunctionUsed for measuring angles and distances on navigational charts.
Keuffel & Esser Company
Date: 1900-1950
Accessories: original cardboard sleeve case
Object number: 1997-1-1625
Union Instrument Corporation
Date: circa 1940
Accessories: wooden case
Object number: 2004-1-0374
French
Date: circa 1740
Accessories: fitted case with embossed leather exterior and coarse canvas interior
Object number: DW0731
Gabriel & Edward Davis
Date: 1830-1850
Accessories: circular mahogany case with one straight edge
Object number: DW0386
Marine Compass Company
Date: 1907
Accessories: mahogany case; two celluloid course protractors (5261a, 5261b)
Object number: 5261a
Elliott Brothers
Date: 1855-1870
Accessories: mahogany storage case lined with blue velvet
Object number: DW0460