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Mathematical Treasures - Giuseppe Alberti's Instruzioni pratiche per l’ingenero civile

Author(s): 
Frank J. Swetz and Victor J. Katz

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Plate VII from Giuseppe Alberti’s Instruzioni pratiche per l’ingenero civile, (1774) [Practical Instructions for Civil Engineers]. Alberti (1712 - 1768) was an Italian engineer and architect.  This illustration on page 298 explains the triangulation method of land measurement employing a sighting staff or surveyor’s cross.  The instrument shown contains a compass for marking bearings.

Dummy View - NOT TO BE DELETED