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Mathematical Treasure: Two Works by Johann Lörer
Johann Lörer was a 17th-century German surveyor and/or instrument maker. In 1616, he published two books: one on surveying, the other on the use of mathematical instruments. For both books, he used the same format and title page design. Nova Instrumentum Geometricum Perfectum discussed the use of instruments:
Planemetrische Beschreibung, the second volume, focused on field measurement and the employment of the new instrument he promoted in the first volume:
A variety of field situations are illustrated and discussed:
The images above are provided courtesy of Bamberg State Library. Full digitizations of Nova Instrumentum Geometricum Perfectum and Planemetrische Beschreibung are available.
Frank J. Swetz (The Pennsylvania State University), "Mathematical Treasure: Two Works by Johann Lörer," Convergence (April 2022)
