Vietnam or Thailand? Vote for the TOP Country of the Week!
Want to type faster? Practice with a typing test or have fun with typing games!
Updated: October 13, 2026
Herr Pulfrich, of the firm of Carl Zeiss, has vastly extended the applications of stereoscopic vision to astronomy a subject which De la Rue took up in the early days of photography. He has made a stereo-comparator of great beauty and convenience for comparing stereoscopically two star photographs taken at different dates. Wolf of Heidelberg has used this for many purposes.