Optical Instrument and Diagrams C017 / 3509
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Optical Instrument and Diagrams C017 / 3509
Plate from 18th century encyclopedia showing various optical instruments. The Main illustration shows a heliostat (from helios, the Greek word for sun, and stat, as in stationary) A heliostat includes a mirror, usually a plane mirror, which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the suns apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space. Other illustrations show devices for grinding and honing reflector mirrors, and the horopter. In studies of binocular vision the horopter is the locus of points in space that yield single vision. Also included are diagrams that study virtual focus of the eye and the halo
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 9341975
© DAVID PARKER/SCIENCE PHOTO LIBRARY
Binocular Encyclopedia Greece Greek Grinding Halo Heliostat Lens Mirror Reflector Sunlight Vision Helios Hone Stat
EDITORS COMMENTS
This print from the 18th-century encyclopedia showcases a fascinating array of optical instruments and diagrams. The central illustration takes us into the realm of ancient Greek ingenuity with the heliostat, derived from "helios" meaning sun and "stat" indicating stationary. A heliostat employs a plane mirror that gracefully pivots to continuously reflect sunlight towards a predetermined target, compensating for the apparent motions of our celestial companion across the sky. Whether this target lies in distant space or is a physical object, this ingenious device ensures an uninterrupted stream of solar rays. Accompanying this remarkable invention are depictions of tools used for grinding and honing reflector mirrors, essential components in harnessing light's power. Another diagram introduces us to the horopter, which holds great significance in binocular vision studies as it represents points in space where single vision can be achieved. Further exploration reveals intriguing diagrams investigating virtual focus within our eyes and even delving into the enigmatic phenomenon known as halo. This comprehensive collection offers glimpses into centuries-old scientific pursuits that have shaped our understanding of optics. Through DAVID PARKER/SCIENCE PHOTO LIBRARY's lens, we are transported back to an era when curiosity sparked innovation and visualizing unseen wonders was at its core.
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