Brass sextant by Jesse Ramsden, in fitted mahogany keystone case, made 1770-75, Piccadilly, London. Sextant has polished brass 120° scale (-2° to 136°) with 20' divisions and brass vernier (30"), ...

There's nothing mystical or complicated about a sextant. All it is is a device that measures the angle between two objects. The sextant makes use of two mirrors. With this sextant, one of the ...