Construction of Jacob's Staff by Frisius, Mechanism for Variable Crosspiece by Metius, Methods of Constructing Scales for the Marine Jacob's Staff by Cortes, Waghenaer, and De Cespedes Respectively. Original caption: From: Surveying Instruments, Their History and Classroom Use, by Edmund R. Kiely, Bureau of Publications, Teachers College, Columbia University, New York, 1947.

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