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Joseph Halden
Ernest Hogg
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Abstract
4917. Halden, J., and Hogg. E. Feb. 29. Mathematical drawing- i n s t r u - ments.-The joint between the loose part and the body of a pair of dividers, compasses, &c. comprises a plug 5, on one part, with a saw-cut 7 to allow the plug to expand within a socket 8, in the other part, and a projection 6 which fits a slot 9, opening into the socket 8, to prevent turning.
GB190404917D1904-02-291904-02-29Improvements in Mathematical Drawing Instruments.
ExpiredGB190404917A
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