Pair of Theotorlites and a Map Plotter

Description:

Pair of Theotorlites and a Map Plotter, used for sun radiation study, the theotorlites with eyepiece set at 90 degrees to the telescope, both on a rotating shaft, base with bubble levels and electrical contacts on rotating platform, both housed in custom made wooden cases, each with its own tripod; large aluminum map plotter with a full circle indicator on arm divided into half degrees, in a oak box.

Provenance: Dr. Brian O'Brien.
Estimate $1,000-1,500

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