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Description: | Beam compass, metal frame marked "HO 8", length of frame 2' 6 1/2",width 4", arm divided on silver to 1/20", reading by vernier to 1/1000", clamp and screw motion, with screw adjustment for pencil | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | compasses (drawing instruments) beam compasses | Source: | Science Museum | Identifier: | 1911-375 | Go to resource |
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