Reflections from the glass and from the surface film cancel each other out and do not affect the eye. By this method, 99 per cent, of light passes through the glass instead of about 92 per cent, ordinarily.
Dr. Langmuir showed me a gauge, the dial of which was covered half with ordinary glass and half with treated glass. There was no doubt about it, It should be a boon for art galleries, In many of them the glass in front of the pictures picks up so many stray reflections that it is quite dificult to find a good viewpoint.
The method is not yet perfect. Optical lenses made from very hard glass can be fine-coated with quartz ind can be quite hard. But the coating on ordinary plate-glass is still too uft for everyday use.
Text read from the printed page and cleaned; old type leaves the occasional error.