Quarter-circle contact goniometer with fixed arms

unsigned (but certainly R. Fuess, Berlin)
Quarter-circle contact goniometer (nickel plated brass, steel arms, length of the arms 10 cm) in red plush-lined cloth covered case (13.4 x 9.4 x 2.4 cm).
Unsigned, but certainly R. Fuess, Berlin, end 19th century. This model was described by Th. Liebisch (Grundriss der Physikalischen Krystallographie, 1896)

private collection








Quarter-circle goniometer as depicted in P. Groth, "Physikalische Krystallographie" 4th ed., Leipzig, 1905. p. 632, fig. 664