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Schwarzschild

Karl Schwarzschild (1873-1916), a noted German astronomer who was also interested in ballooning, designed various instruments for aeronautical use.

Ref: K. Schwarzschild, "Künstlicher Horizont & Ballonsextant," Zeitschrift für Instrumentenkunde 30 (1910): 357-359.

K. Schwarzschild, "Libellenhorizont und Libellensextant," Zeitschrift für Flugtechnik und Motorluftschiffahrt 4 (1913): 177-180.

Sally Dieke, "Karl Schwarzschild," in Dictionary of Scientific Biography 12 (1975): 247-253.

Collection:

Bubble Sextant
Spindler & Hoyer Bubble Sextant (#1590)