Georgian Mahogany & Brass Inclinometer Rule c. 1775

An interesting and very scarce Georgian mahogany cased folding inclinometer rule c.1775. Inclinometer rule having 12” mahogany surround with high quality central lay-flat brass hinge, the outer bottom edge marked in inches from 1” - 12”. The inner right hand side having inset brass inclinometer with swinging hand with a scale displaying 90° - 0° - 90°, the left hand side cut out to accommodate the inclinometer hand when closed. Twin brass folding sights to upper corners. Condition: In very good antique condition, the hinge sound and opening completely flat, the inclinometer hand swinging freely. Comments: A scarce instrument - we’ve not seen another such example, though we have a similar inclinometer included within a mahogany cased compass on Love Antiques (see Braham Compass Clinometer) - used for measuring angles and elevation. Very well made and in excellent original condition, one for the collector of Georgian surveying instruments and rules.