6 inch transit theodolite by Henry Barrow & Co.
6 inch transit theodolite by Henry Barrow & Co., c.1850
6 inch transit theodolite by Henry Barrow & Co., c.1850
6 inch transit theodolite by Henry Barrow & Co., c.1850
Eyepiece for 6 inch transit theodolite by Henry Barrow & Co., c.1850
Accessories for 6 inch transit theodolite by Henry Barrow & Co., c.1850
Small component for 6 inch transit theodolite by Henry Barrow & Co., c.1850