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Title: Two brass single-arm protractors divided in half degrees and [Go to resource]
Description: Two brass single-arm protractors divided in half degrees and reading by vernier to one minute of arc. Arm projects 3 inches beyond circle License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: drawing instruments
semi-circular protractorsTemporal: 1876 Source: Science Museum Creator: W. F. Stanley & Co. Ltd. Identifier: 1876-640 Go to resource More Like this...
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