A rare Italian 17th-century brass protractor-square
by Giacomo Lusverg (c. 1636-1689), dated 1688
the degrees divided to 0°30', numbered by 10°, 0°-140° on the protractor then 140°-180° on the square, inner non-linear scale numbered by 1, 3-12 on the inside of the protractor, both sides of the square carrying scales, the reverse decorated with engraved foliage and green-man, signed Iacobus Lusuerg Faciebat Romæ 1686.
4½in. (11.5cm.) long
A rare Italian 17th-century brass protractor-square
by Giacomo Lusverg (c. 1636-1689), dated 1688
the degrees divided to 0°30', numbered by 10°, 0°-140° on the protractor then 140°-180° on the square, inner non-linear scale numbered by 1, 3-12 on the inside of the protractor, both sides of the square carrying scales, the reverse decorated with engraved foliage and green-man, signed Iacobus Lusuerg Faciebat Romæ 1686.
4½in. (11.5cm.) long
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