AFOCAL GLASSES, MAGNIFYING SPECTACLES, TELESCOPE CUPOLAS, CUPOLA SEGMENTS OR THE LIKE AND COMBINATIONS WITH OPTICAL SYSTEMS KNOWN AS WEAK BINOCULAR WITH LARGE FIELD OF VISION, GOOD IMAGE DEFINITION AND HIGH LIGHT EFFICIENCY

摘要

Afocal glasses with spherical convex-concave boundary surfaces and with an identical curvature center, as a weak binocular with a large field of vision and as additional elements for optical apparatuses. Description of principles of fabrication of afocal glasses according to the formulae of Snellius and Reiner and of the practical possibilities of utilization of afocal glasses in telescope cupolas, in telescopes and in combinations with periscopes, cameras, microscopes, light-guides and documentation systems.