An American surveying instrument on a backstaff principal, with 24¾in. telescope sight(no lens), the arc with graduated scale, internal adjustment, wooden closed frame - 25¼in.wide
An American surveying instrument on a backstaff principal, with 24¾in. telescope sight(no lens), the arc with graduated scale, internal adjustment, wooden closed frame - 25¼in.wide
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
