Negretti & Zambra Combined Alidade Rule and Square, London, 19th century, lacquered, and anodized brass instrument signed on the underside "Manufactured by Negretti & Zambra, London/Patentee George Francis C.E. Chester," two sets of folding sights, and bubble level on the outer edge, engraved faceplate with conversion scales, folding sights, dual bubble levels, vernier, 3-in. silvered compass, housed in its original leather fitted case, lg. 8 in. closed.
Negretti & Zambra Combined Alidade Rule and Square, London, 19th century, lacquered, and anodized brass instrument signed on the underside "Manufactured by Negretti & Zambra, London/Patentee George Francis C.E. Chester," two sets of folding sights, and bubble level on the outer edge, engraved faceplate with conversion scales, folding sights, dual bubble levels, vernier, 3-in. silvered compass, housed in its original leather fitted case, lg. 8 in. closed.
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.jpg "Quelle: Christie's")
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