Sammelband
With 10 writings. 19th century. 4°.... Lot 1576
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Sammelband
With 10 writings. 19th century. 4°. Central cloth with rtit. (foxing and somewhat rubbed). Contains among others:╗ Wellmann,V. On a new double-image micrometer. 1890. p. (141)-145. - Knopf,O. Refractors in conjunction with mirrors. 1891. p. (17)-23. - Fritsch,K. A new universal tripod for astronomical telescopes. 1893. pp. (273)-276. - Others. Partly stained and browned.
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