Réf : 69689
Large marine octant signed John Uring made circa 1750
Large wooden octant of HADLEY type - with 2 inputs with sighting pinnules and 1 set of 2 movable filters - Without handle for holding the instrument which will come later.
John Hadley (1682-1744) was the inventor of this type of octant with wooden limbs with "transverse" divisions.
Signed by John Uring in activity between 1735 and 1771.
Reference: similar to the Getty Museum - also ill. p. 112 "The Marine Antiquarian" Jean Randier and ill. p. 97 "The Instrument of Marine" Jean Randier.
London c. 1750.