Negretti & Zambra, London
Ocular goniometer (nickel plated brass), with engraved
scale and vernier read-out, ocular and cross wires (height
10.2 cm). In blue plush-lined leather-covered case (width
11.5 cm, height 10 cm).
Unsigned but with an etiquette on the inside of the cover
that states "NEGRETTI & ZAMBRA | 122, REGENT
ST. | LONDON.W.I.", last quarter of 19th century.