Colossus of Rhodes statue
Colossus of Rhodes. Historical artwork showing the vast bronze statue of the Greek sun god Helios (later identified with Apollo, the god of light), at the entrance of the harbour at Rhodes, a Greek island in the Aegean Sea. The statue, standing 33 metres tall, was completed in 282 BC and stood for only 56 years before being destroyed in an earthquake. Even the broken remains were so impressive that people travelled from afar to see them. They remained in Rhodes for around 800 years until the Saracens invaded and sold them, supposedly transporting them to Alexandria on the backs of 900 camels. This engraving is from Maerten van Heemskerck's 16th century book Seven Wonders of the World, and reproduced in The Picture Magazine, 1894.
© SHEILA TERRY/SCIENCE PHOTO LIBRARY
The Colossus of Rhodes, Greece, 1933-1934. Artist: Unknown
The Colossus of Rhodes, Greece, 1933-1934. The Colossus of Rhodes was a colossus of the Greek god Helios, erected on the Greek island of Rhodes by Chares of Lindos between 292 and 280 BC. It is considered one of the Seven Wonders of the Ancient World. Before its destruction, the Colossus of Rhodes stood over 30 metres (107 ft) high, making it the tallest statue of the ancient world. From Wonders of the Past, volume II, 1933-1934.
© The Print Collector / Heritage-Images
Optical Instrument and Diagrams
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 sun's 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.
© DAVID PARKER/SCIENCE PHOTO LIBRARY