IMPROVEMENTS OR RELATING TO TEÉMETROS, altimeters AND SIMILAR INSTRUMENTS MEASURING OPTICAL operate on the principle CORRESPONDENCE

摘要

Improvements in or relating to rangefinders, altimeters and similar optical measuring instruments operate on the principle of coincidence, characterized in that it has two eyepieces, one for each eye of the beholder and that is constructed so that portions of the two beams are not target one of the two eyepieces by the transmitting and reflecting screen are directed by it to the other eye.