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dichroscope J.H. Steward, London

Dichroscope, J.H. Steward, London

Dichroscope, lacquered brass with calcite (Iceland spar) and focusable ocular in mahogany case (10.1 x 6.9 x 3.4 cm). Tube (length 5.3 cm, diameter 1.6 cm) with adjustable specimen holder on the front.
Signed on the tube "MADE IN ENGLAND | J.H. STEWARD LTD. | LONDON", first half 20th century.

Dichroscope, Winkel, Göttingen

Dichroscope, Winkel, Göttingen

Dichroscope, nickel plated brass with calcite (Iceland spar), focusable ocular in plush and silk lined leather case (17.3 x 11.1 x 5.2 cm). Tube (length 6.6 cm, diameter 2.1 cm) with wooden holder (lacquered black) and adjustable specimen holder on the front.
Signed "WINKEL | GÖTTINGEN" and serial number "7434". Also signed on the case "R. WINKEL | GĂ–TTINGEN", first half 20th century.