Three measuring instruments: - Small horizontal Butterfield-type brass sundial with index alternating Roman and Arabic numerals, latitudes of twenty-two European cities on reverse, eight-way removable glass compass and bird-decorated gnomon. Signed MENANT, Paris. Pierre-Louis Menant was active in Paris from 1730 to 1750. Work from the first half of the 18th century. 7.2 x 6.4 cm. A few scratches and traces of oxidation. Chips at the edge of the compass glass. Needle and style missing. - Wooden and brass long sight with sliding lids, with one print. Unsigned. Open length: 58 cm. - Closed length: 34 cm. Scratches, bumps and minor traces of oxidation. Eyecup missing. - Alidade" type compass in a wooden case with folding pinnule and brass trim, including a rose engraved on paper and an inclinometer in thousandths with openwork sight and graduated lateral ruler. Signed "G. Lézy, Paris". Open size: 9 x 17 cm. Shocks, scratches, cracks and traces of oxidation.