Surveyor's Theodolite by L. Casella with Burt's Patent Solar Attachment, London, no. 5191, brass and gunmetal finish, 2 1/4-in. silvered dial signed L. Casella, London, 5191, needle ring calibrated 0-360, cardinal points in block lettering, horizontal plate with dual verniers and magnifiers, twin "A"-frames supporting a 12-in. telescope and silvered half circle calibrated 0-100 in two quadrants, the solar attachment with horizontal silvered hour circle calibrated 0-12 in two quadrants and 4 1/2-in. declination arc with vernier read-out, tri-foot leveling base and walnut fitted carrying case and accessories, with wood tripod, instrument ht. 14 in.
Surveyor's Theodolite by L. Casella with Burt's Patent Solar Attachment, London, no. 5191, brass and gunmetal finish, 2 1/4-in. silvered dial signed L. Casella, London, 5191, needle ring calibrated 0-360, cardinal points in block lettering, horizontal plate with dual verniers and magnifiers, twin "A"-frames supporting a 12-in. telescope and silvered half circle calibrated 0-100 in two quadrants, the solar attachment with horizontal silvered hour circle calibrated 0-12 in two quadrants and 4 1/2-in. declination arc with vernier read-out, tri-foot leveling base and walnut fitted carrying case and accessories, with wood tripod, instrument ht. 14 in.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
