
TechnologyDecember 26, 1914
Air Transparency for Infra-Red Rays
Application of These Rays to Telephotography

Air Transparency for Infra-Red Rays
Application of These Rays to Telephotography

Flowers Photographed with Invisible Light
High Reflecting Power for Ultraviolet Rays of Certain Yellow Blossoms

Skin Defects in Invisible Light
A Method that may have a Wide Application in Medicine

How to Make an Ultra-violet Ray Objective