Rude Star Identifier (modified) by Gilbert T Rude b1881 d1

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From http://ns2.holidays.net/store/Ww2-Rude-Star-Finder-And-Identifier-A-n-Type-1-Hydrographic-Office-No-2102-c_271755033778.html
[A description of a similar model for sale altered to refer to this example]

This device is designed especially for use of aircraft. It gives the positions of all the stars included in both the American and British Air Almanacs, and may be used either for identifying or spotting stars.

Published by the U.S. Navy Hydrographic Office in March 1942 under the authority of the Secretary of the Navy. It is based on the original Rude Star Finder patented by Captain Gilbert T. Rude of the U.S. Coast & Geodetic Survey in 1921 and was modified by Elmer Collins of the United States Hydrographic Office.

It has the 5, 15, 25, 35, 45, 55 and 65 degree templates. It is in very fine condition given its age. Minor scuffing on the templates. The star chart is still clean and bright. Fits in a leatherette wallet just under 10 inches across.

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from https://en.wikipedia.org/wiki/Gilbert_T._Rude
1881 to 1962
Name pronunciation roo dee
The illustrious life of Gilbert T Rude

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These patents are relevant:-

US Patent 1401446 Gilbert T Rude 1921

US Patent 1919222 Henry M Jensen et al. 1933

US Patent 2337545 Elmer B Collins 1943

US Patent 2304797 Elmer B Collins 1941

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Rude Star Finder (2102-C)

The Smithsonian entry
https://amhistory.si.edu/navigation/object.cfm?recordnumber=1253891

Catalogue number:
PH*315071.3

Inscriptions:
"No. 2102-C / A-N TYPE 1 / STAR FINDER AND IDENTIFIER / PATENT Nos. 2304797 - 2337545 / U.S. NAVY HYDROGRAPHIC OFFICE"

Dimensions:
diameter 8.5 inches

Discussion:
This star finder, designed for aeronautical use, was based on the Rude form as modified by Elmer Collins of the United States Hydrographic Office. It consists of a white plastic planisphere with the northern sky on one side and the southern on the other that shows all the stars in the American and the British Air Almanacs; nine clear plastic altitude-azimuth templates for use at different latitudes up to 85o north and south; an instruction card; and a leatherette container. It was published in March 1942 under the authority of the Secretary of the Navy, and cost $2.50. The Hydrographic Office transferred this example to the Smithsonian in 1957.

Ref: E. B. Collins, "Star Finder," U.S. patent #2,304,797

E. B. Collins, "Star Finder," U.S. patent #2,337,545

Nathaniel Bowditch, American Practical Navigator (Washington, D.C.: Unted States Hydrographic Office, 1943), pp. 212-214.

"Elmer B. Collins," Washington Post (2 October 1958), p. B2.

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National Maritime Museum, London UK
https://collections.rmg.co.uk/collections/objects/257557.html

Object ID NAV1892
Description Star identifier board marked with names of constellations. 2 sides - one for north, one for south The seven plates and case are marked NAV1892.1-2 and can be found via the Whole/Part toggle. From label with it: Published by the Hydrographic Office Washington in 1942 principally for the use of air navigators. It used the same principle as the original Rude Star Finder patented by Captain G.T. Rude. The instrument is a calculator, identical in principle with an astronomer's astrolabe. Plates are provided for use in different latitudes.
Date made 1942

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Note: the central post of the star chart disc has been removed to facilitate the scans. This item was refitted once scanning had been completed.

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