A HIGHLY IMPORTANT MEDIEVAL ASTROLABE QUADRANT PROBABLY SOUTHERN FRANCE, 1291-1310 The brass quadrans novus of 4 ¾-inch radius, engraved with red and black wax infill. The front: carrying scales for CORDA RECTA and CORDA V[ER]SA and unlabelled scales for determining sine and cosine to edges; zodiac along perimeter with the name alternating in red and black, inside this a double degree scale; central shadow square and unequal hour lines; folded ecliptic and tropics delineated; eleven named ( DABARA, SPATV.GE.SINIST, alabor, mocadani, cor leo, algova, cauda corvi, alaasel, cor scorpi, ahlaca, altair) and nine unnamed stars given. The reverse carries concentric rings for lunar mansions, zodiacal and calendrical scales, a partial index pointer survives. Both sides with (ownership mark?) FTD engraved in a different, contemporary hand. One sight with two viewing holes still attached to top edge. In contemporary moulded cuir-bouilli case, both sides with shield within a circle, surrounded by geometric and foliage decoration. Housed in modern box. 6 x 5 ½in. (15 x 14cm.) in case Provenance Acquired by Nico Israel in 1987.
A HIGHLY IMPORTANT MEDIEVAL ASTROLABE QUADRANT PROBABLY SOUTHERN FRANCE, 1291-1310 The brass quadrans novus of 4 ¾-inch radius, engraved with red and black wax infill. The front: carrying scales for CORDA RECTA and CORDA V[ER]SA and unlabelled scales for determining sine and cosine to edges; zodiac along perimeter with the name alternating in red and black, inside this a double degree scale; central shadow square and unequal hour lines; folded ecliptic and tropics delineated; eleven named ( DABARA, SPATV.GE.SINIST, alabor, mocadani, cor leo, algova, cauda corvi, alaasel, cor scorpi, ahlaca, altair) and nine unnamed stars given. The reverse carries concentric rings for lunar mansions, zodiacal and calendrical scales, a partial index pointer survives. Both sides with (ownership mark?) FTD engraved in a different, contemporary hand. One sight with two viewing holes still attached to top edge. In contemporary moulded cuir-bouilli case, both sides with shield within a circle, surrounded by geometric and foliage decoration. Housed in modern box. 6 x 5 ½in. (15 x 14cm.) in case Provenance Acquired by Nico Israel in 1987.
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