£280
A RARE EXAMPLE OF 'CAPTAIN DOUGLASS'S REFLECTING PROTRACTOR' BY CHISLETT, LONDON, CIRCA 1850
constructed in lacquered brass, the arc divided 0-140º -- 5½in. (14cm.) diameter
This is a protractor with a Vernier and arm carrying a pair of reflectors similar to the sextant. This instrument can be held in the hand, and true angles taken as with the sextant, and the angles can be at once drawn by the instrument. It is very accurate for sketching upon the ground.
Ref: W.F. Stanley: Mathematical Drawing Instruments W. E. & F. Spon, London 1878 p.232-3
Missing index mirror, horizon mirror tarnished, lacking case.
Fees apply to the hammer price:
Free Registration
27.6% inc VAT*
Flat Fee Registration
24.00% inc VAT*
