Title: Heather, J. F.: The Eidograph. In: Idem: Mathematical Instruments. Their construction, Adjustment, testing, and use comprising drawing, measuring, optical, surveying, and astronomical instruments. Vol. 1: Drawing and Measuring Instruments. Enlarged edition, for the most part entirely re-written. London 1870, pp. 70-75.

Part of collection(s): Miscellaneous

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