498. [Surveying]

3 optical squares, a spirit level, 2 magnetic needles and a plumb.

1. Optical square or "équerre à réflexion". Brass, mirror and wood, 5 x 6 x 13 cm. 19th c. - 2. Optical square. Brussels, A. Beaulieu, 19th c. Brass, 10,7 x 2,2 x 2,4 cm. Signed and numbered "180". Leather box. - 3. Miniature optical square. Metal, 4,3 cm. Leather pouch. - 4. Brass spirit level. 14 cm. In box. - 5-6. 2 magnetic needles fixed in a case with diametrically opposed reference lines. Brass, 14,7 cm and wood, 16 cm. - 7. Plumb. Brass, ca. 7 cm with rope (new?).

Hammer price: € 200

€ 100 / 200

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