Brass Goniometer with Turned Wood Platform, Secretan, Paris, 19th century, the platform supports thumbscrew-adjusted leveling feet, circular base with centrally mounted pillar, wheel coarse adjustment and thumbscrew fine adjustment, with vernier readouts on edge of disc numbered 0-180 in each direction, and folding and screw-adjusted specimen holder, overall ht. with platform 8 1/4 in.
Brass Goniometer with Turned Wood Platform, Secretan, Paris, 19th century, the platform supports thumbscrew-adjusted leveling feet, circular base with centrally mounted pillar, wheel coarse adjustment and thumbscrew fine adjustment, with vernier readouts on edge of disc numbered 0-180 in each direction, and folding and screw-adjusted specimen holder, overall ht. with platform 8 1/4 in.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
