Donder's Phaenophthalmotrop

Instrument Maker: Spindler & Hoyer, Germany
Year Made: c. 1921

Dimensions: h = 54 cm
Materials: brass, metal

Description: The sphere rotates on three axes. Each axis has a dial with four measurement quandrants, each marked "0" through "90"; a fourth dial rests on the optical piece which connects to two antennae; the lens is removable; the optical chamber runs through the sphere to an opening on the other side. For more information, see Spindler & Hoyer, Catalogue, 1921. p.33-35.






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