Images Dated 3rd June 2003

DH-2845

DH-2845
Black-chinned / Golden Backed Honeyeater - on Long-leaved Corkwood, Hakea suberea
Ormiston Gorge, West MacDonnell National Park, NT. Australia
Melithreptus gularis laetior
Don Hadden

© Don Hadden / ardea.com

Australasia, Australasian, Australia, Australian, Bird, Black Chinned, Corkwood, Corkwoods, Drinking, Drinking Nectar, Eating, Feeding, Flower, Flowers, Hakea Suberea, Honeyeater, Honeyeaters, Long Leaved, National Parks, Nectar, Oceania, Pla Nts, Plant, Single, Wild Life

Newtons own drawing of his reflecting telescope

Newton's telescope. Sir Isaac Newton's own drawing of his first reflecting telescope design. Newton invented the reflecting telescope in 1668. It worked by focusing light using a parabolic mirror (V). This reflected light back up the tube of the telescope to another mirror (D) which reflected it into the eyepiece (F). The design avoided the chromatic aberration and loss of light caused by the use of lenses and was highly successful; the largest modern telescopes are all of the reflect- ing variety. This first telescope was only 15 cm long and 2.5 cm in diameter but could magnify 30- 40 times. He built a second, larger version in 1671. Image taken from a 1672 letter by Newton

© SCIENCE PHOTO LIBRARY

Non-magnetic iron sulphide

Demagnetisation of iron. Image 3 of 3. Iron sulphide being tested for magnetism with a bar magnet. The iron sulphide is not magnetic. Metallic iron is magnetic, and is attracted to a magnet. When iron is reacted with sulphur, as it has been here, the resulting compound does not retain the magnetism of the iron. See images A230/083-085 for a sequence showing the iron being demagnetised by a reaction with sulphur

© ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY