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Polariscopes and related instruments


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Nörremberg-type polariscope
Polariscope with fixtures (lacquered brass) mounted between two steel rods (length 42.2 cm). Circular base (lacquered brass, diameter 12.3 cm) mounted on square (22 cm) mahogany base (height 10 cm) with drawer. Fixtures include mirrored base, glass polarizing plate, circular stage, 3 condensing lenses, specimen holder and black glass analyzer plate.
Signed on drawer "HANS HEELE | Werkstätten für | PRÄZISIONSOPTIK & MECHANIK | BERLIN, 0.27", 1st half 20th century.

Nörremberg-type polariscope




Nörremberg-type polariscope
Polariscope (lacquered brass) with fixtures mounted between two rods. Circular base mounted on square (18.7 cm) mahogany base (height 6 cm) with drawer. Fixtures include mirrored base, glass polarizing plate with graduated wheel and pointer, graduated rotating and tilting glass specimen stage and a rotatable analyser prism with vernier read-out. Total height: 51 cm.
Signed "Jules Duboscq | à Paris", 2nd half 19th century.

Nörremberg-type polariscope




Nörremberg-type polariscope
Polariscope (lacquered brass, oxidized brass) fixed on a circular base (total height 33 cm). Reflecting mirror (9.5 x 12.5 cm), pile-of-plates polarizer, condenser, and objective, focusing optics and Nicol prism analyzer.
Unsigned, but almost certainly made by Steeg and Reuter in Bad Homburg vor der Höhe, first half 20th century.

Nörremberg-type polariscope




Nörremberg-type polariscope
Polariscope (lacquered brass, nickel plated brass, oxidized brass) with maple case also used as base (30.8 x 13 x 9.7 cm; total height 35.8 cm). Reflecting mirror, pile-of-plates polarizer, condenser, round stage, objective, focusing optics and Nicol prism analyzer.
Unsigned, first half 20th century.
Nörremberg-type polariscope




Polariscope
Polariscope tube (lacquered brass) with rack and pinion focusing. Black painted cast iron base, mirror on mahogany support. Nicol prism polarizer with 360-degree scale, condensing lens, Nicol prism analyzer, ocular. Height of the instrument 36 cm.
Signed on the polarizer scale "R. FUESS | BERLIN", serial number "6776" on base, first half 20th century.
polariscope




Projector polariscope
Polariscope - optical bench with numerous accessories to demonstrate and investigate polarization phenomena in crystals by means of projection.
Lacquered brass polariscope and accessories on cast iron base (height:  35 cm) with brass rail (length: 34.6 cm), total height of the instrument: 48 cm. The accessories are stored in a wooden box (44.7 x 22.9 x 13.6 cm).
Signed "F. Pellin, Paris" on the rail, early 20th century (1912 or later)



Projector polariscope




Polariscope specimens
Set of 24 polariscope specimens mounted in square paper covered cork plates (3.5 cm), with circular glass support (diameter 1.3 cm, one of 0.6 and one of 2.4 cm). The names of the samples are printed on the paper cover. In compartmented black cardboard case with plush lined cardboard cover.
Signed on the paper covers "Optisches | Institut | von | Dr. STEEG & REUTER | in | Homburg v.d.H.", first half 20th century.

Polariscope specimens




Tourmaline tongs
Two thin sections of transparent tourmaline mounted in cork in independently rotatable oxidized brass disks (diameter 2.8 cm) at the ends of a pair of spring tongs (length 15 cm).
Unsigned, first half 20th century.

Tourmaline tongs




Disc with mineral sections illustrating optic-axis figures
Mahogany disc (diameter: 7.5 cm) rotatable between thin sections of tourmaline (mounted in ivory eyepieces); 10 crystal sections are mounted to show optic-axis figures: topaz, aragonite, gypsum, sulphate of barytes, carbonate of lead, fluor spar, quartz, borax, nitre, calc spar.
The instrument (total length 18 cm) rests in its plush-lined cardboard case (8.2 x 19.3 cm) with a label reading "Toermalijn | platen | (opt. assenbeelden)" i.e. "tourmaline sections (optic axis figures)".
Unsigned, second half 19th century.

Disc with mineral sections illustrating optic-axis figures




Stauroscope
Stauroscope for the measurement of extinction angles in crystal sections. Reflecting glass plate polarizer (10.8 x 10.8 cm) on a mahogany base (21 x 13.5 cm); graduated half circle (diameter 9.5 cm) on the lacquered brass body tube (length: 19 cm).
unsigned, but probably Böhm & Wiedemann, München



stauroscope