Brass Box "Pocket" Sextant ca late 19th Century U-2 or by the ground crew

or by the ground crew pre-flight

but its pure speculation

It is Part IV in a series and includes Section 11

Observers worked within the structure of the Ground Observer Corps to ensure proper training and communication

Very cool indeed

Brass Box "Pocket" Sextant ca late 19th Century U-2 or by the ground crewThis is an original brass Box Sextant, or "Pocket" Sextant. At 3 inches in diameter and 1. 5 inches when closed, it could easily fit in the pocket of a mariner for determining position at sea or for determining horizontal positions on land. Box sextants have been around since the early 1800's. We speculate this example was made in the late 19th century. The protective outer case unscrews from the mechanism platform and screws back on to it's opposite