Rude Star Finder (1921)

Description
The Rude Star Finder lets a navigator identify a star from its altitude above the horizon. It consists of planispheric maps of the northern and southern skies, the rims of which are graduated to two minutes of time. Each planisphere has a celluloid meridian arm for determining the declination of stars, with a slide that can be adjusted for the latitude of the observer. There are in addition eleven transparent celluloid altitude-azimuth templates for use at different latitudes up to 66° north and south–that is, over the greater part of the navigable waters of the globe; a set of pins for marking the positions of the planets; an instruction brochure; and a cardboard case. The instrument bears the inscription "THE MARINER'S PRACTICAL STAR FINDER / A SIMPLE MEANS FOR IDENTIFYING AND SPOTTING STARS AND PLANETS / ... / G. T. RUDE Hydrographic and Geodetic Engineer / U.S. Coast and Geodetic Survey / Patents applied for / Price $12.00"
Gilbert Rude applied for a patent for this device in December 1920. This example was made before the patent issued in December 1921. Rude donated it to the Smithsonian in 1957.
Location
Currently not on view
Object Name
star finder
date made
1921
maker
Rude, Gilbert T.
Measurements
overall: 14 in; 35.56 cm
ID Number
PH*315070
catalog number
315070
accession number
214892
subject
Measuring & Mapping
Navigation
See more items in
Medicine and Science: Physical Sciences
Navigation
Data Source
National Museum of American History, Kenneth E. Behring Center

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