Ocular Goniometers

Ocular goniometer (nickel plated brass), with engraved scale and vernier read-out, ocular and cross wires (height 9 cm). In red plush-lined leather-covered case (width 10.5 cm, height 7.5 cm).
Signed "R. Fuess Berlin-Steglitz" on the circle and an etiquette with the text "R. | FUESS | BERLIN-STEGLITZ" is glued on the cover of the case, end 19th century.

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.

Ocular goniometer, chrome plated brass with engraved scale and vernier read-out, ocular and cross wires (height 4.5 cm). In wooden case (width 10.2 cm, height 5.8 cm).
Signed "BECK LONDON" on the circle, first half 20th century.