Lot 49
49
MAGINUS, Johannes Antonius (1555-1617). De planis triangulis liber unicus. Eiusdem de dimetiendi ratione per quadrantem, & geometricum quadratum, libri quinque. Venice: Robertus Meiettus and Bologna: Meiettus and Giovanni Battista Ciotto, 1592. Small 4° (210 x 145mm). Printer’s device on title, numerous woodcut illustrations or diagrams, ornamental initials, headpieces. (Lower margin of title repaired, light water-staining mainly in lower margin at beginning, outer margin of O4r repaired, stain in outer margin from fol. 95 to end, a few leaves browned or stained, some spotting.) Contemporary vellum, lettering-piece, author and date in manuscript on front cover (lightly soiled, extremities rubbed). Provenance: faded inscription on title.
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MAGINUS, Johannes Antonius (1555-1617). De planis triangulis liber unicus. Eiusdem de dimetiendi ratione per quadrantem, & geometricum quadratum, libri quinque. Venice: Robertus Meiettus and Bologna: Meiettus and Giovanni Battista Ciotto, 1592. Small 4° (210 x 145mm). Printer’s device on title, numerous woodcut illustrations or diagrams, ornamental initials, headpieces. (Lower margin of title repaired, light water-staining mainly in lower margin at beginning, outer margin of O4r repaired, stain in outer margin from fol. 95 to end, a few leaves browned or stained, some spotting.) Contemporary vellum, lettering-piece, author and date in manuscript on front cover (lightly soiled, extremities rubbed). Provenance: faded inscription on title.

Details
MAGINUS, Johannes Antonius (1555-1617). De planis triangulis liber unicus. Eiusdem de dimetiendi ratione per quadrantem, & geometricum quadratum, libri quinque. Venice: Robertus Meiettus and Bologna: Meiettus and Giovanni Battista Ciotto, 1592. Small 4° (210 x 145mm). Printer’s device on title, numerous woodcut illustrations or diagrams, ornamental initials, headpieces. (Lower margin of title repaired, light water-staining mainly in lower margin at beginning, outer margin of O4r repaired, stain in outer margin from fol. 95 to end, a few leaves browned or stained, some spotting.) Contemporary vellum, lettering-piece, author and date in manuscript on front cover (lightly soiled, extremities rubbed). Provenance: faded inscription on title.

First and only edition of this treatise on plane triangles. The work ‘contains the most extensive table of squares and roots that had appeared up to 1592’ (Smith). Giovanni Antonio Magini was professor for mathematics and astronomy at Bologna. Adams M-116; Graesse IV, 336; Riccardi I, 2,66; Smith Rara Arithmetica, pp. 399-400.
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