A BRASS MINING THEODOLITE, CONSTRUCTED FROM TWO INSTRUMENTS,THE VERTICAL HALF-CIRCLE SIGNED ON THE BACK SIDE WM. WILTON, ST. DAY, WITH SHAPED SEGMENT INCORPORATING A VERTICAL READING POINT AND BUBBLE LEVEL, THE SILVERED COMPASS DIAL WITH EDGE BAR NEEDLE ON JEWELLED PIVOT WITH STOP SIGNED W. GILBERT LONDON, THE LIMB WITH CROSS BUBBLE AND TWO SLIDING SIGHTS ON TRIPOD/STAFF ATTACHMENT WITH TURNED OAK BASE - 9 1/8IN HIGH

細節

A BRASS MINING THEODOLITE, CONSTRUCTED FROM TWO INSTRUMENTS,THE VERTICAL HALF-CIRCLE SIGNED ON THE BACK SIDE WM. WILTON, ST. DAY, WITH SHAPED SEGMENT INCORPORATING A VERTICAL READING POINT AND BUBBLE LEVEL, THE SILVERED COMPASS DIAL WITH EDGE BAR NEEDLE ON JEWELLED PIVOT WITH STOP SIGNED W. GILBERT LONDON, THE LIMB WITH CROSS BUBBLE AND TWO SLIDING SIGHTS ON TRIPOD/STAFF ATTACHMENT WITH TURNED OAK BASE - 9 1/8IN HIGH
SEE FRONT COLOUR ILLUSTRATION

出版

CF: J.A. BENNETT THE DIVIDED CIRCLE PL.100. FOR A SIMILAR INSTRUMENT BY CARY