THORNTON COLLECTION: INSTRUMENTS & PARAPHERNALIA
Wednesday, 30 June - Tuesday, 6 July 2021
9½-INCH RADIUS EBONY OCTANT BY DOLLAND, LONDON...
Estimate $600 - $1,400
Realised: $1,450 plus premium
Lot Details
marked on ivory plaque on the crossbar; with ivory scale divided -5º to 100º; brass index arm; ivory vernier scale divided 0º-20 º; brass thumbscrew lock to back and screw adjuster to front; brass two hole sighting vane with swivel shutter; brass mirror; shades (green; red; red); horizon glass adjustment by lever and adjuster screw; horizon shades (green red); shade and horizon glass on brass table. Ivory cap (no pencil) to crossbar and ivory writing plaque to verso. With oak stepped box. c.1820.
