This Stereoscope uses mirrors and close focusing binoculars to enable the operator to view two large photographs of the same object, taken from slightly different positions, and see the result in 3D.

• 被皇家空军用作航空侦察拍摄，奇怪的是我看出去时白茫茫的一片啊，但是仔细检查各部件都完好无损，望远镜本身也时常清晰，还望赐教！