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in subjects: "protractors"  
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Protractor

Description: Three-arm brass protractor (a) with extensions for each arm, and mahogany case (b) with brass fittings; marked “English ca. 1880” on tag, and “TRADE MARK LONDON”
Date: 1880~
Item Type: Refine your search to only Physical Object
Partner: Star of the Republic Museum

Plotter.

Description: Patent for an improvement in "surveying-instruments, and has for its object to produce a simple device whereby certain information can be obtained without the necessity of auxiliary calculations,” (lines 12-15) includes illustration.
Date: March 24, 1891
Creator: Smith, Valentine Hartgroves
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Measuring-Tool

Description: Patent for a measuring tool which uses a bevel and square to provide measurements (like a try-square). It also incorporates an adjustable blade and a protractor.
Date: January 14, 1919
Creator: Greene, Saunders T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Surveyor's Instrument.

Description: Patent for a new and improved surveyor's instrument. This design consists in "[t]he instrument for surveying and analogous purposes, consisting of protractor, right-angled piece, and [additional] piece, the two latter pivoted to move independently on the protractor" (lines 9-13).
Date: March 10, 1885
Creator: Dolman, John H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Protractor.

Description: Patent for a new and improved protractor. This design "is to make a protractor or plotter by which may be calculated the length of the base, perpendicular, and hypotenuse of a right-angled triangle where the latitude and departure or the altitude and depression are given" (lines 15-20). To this end, it consists, "with the semicircular protractor provided with a rectangular opening the edges of which are graduated, and centrally-pivoted vernier, of the departure-scale arranged to move up or down… more
Date: June 10, 1890
Creator: Dolman, John H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Protractor.

Description: Patent for "improvements in drafting instruments and has particular application to a protractor or plotter." (lines 8-10)
Date: December 23, 1913
Creator: Ward, Walter P.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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