[Surveying instruments] Alidade. Paris, Meurand, 2nd half 18th c Brass, 48,2 x 6 x 22,2 cm. Wooden box (x 8,5 x 4 cm). Old alidade type with vanes having rectangular holes to hold a fine wire vertically in the opening. Used on a plane table, but also on the graphometer by Meurand.
[Surveying instruments] Alidade. Paris, Meurand, 2nd half 18th c Brass, 48,2 x 6 x 22,2 cm. Wooden box (x 8,5 x 4 cm). Old alidade type with vanes having rectangular holes to hold a fine wire vertically in the opening. Used on a plane table, but also on the graphometer by Meurand.
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