Axial Angle Apparatus
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Axial
angle apparatus
Instrument for the determination of the optic axial angle
(2V). The instrument was used to measure the apparent
angle made by the optic axes of a biaxial crystal in air
(2E) or in oil (2H). The true angle between the optic
axes (2V) may be obtained by correcting the measurement
for the refractive index (β) of the crystal. The
measurement is done on a crystal section cut at right
angles to the bisectrix.
Lacquered brass, nickel plated brass and oxidized brass.
Graduated circle diameter: 16 cm, height: 32 cm, total
length: 33 cm. Signed: "R. Fuess Berlin". First
half 20th century.
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Axial angle apparatus
Axial angle apparatus, model II, signed: "R.Fuess Berlin-Steglitz".
Lacquered brass, nickel plated brass and oxidized brass.
Graduated circle diameter: 16 cm, height: 32 cm. Circa 1900.
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