Isaac Newton's reflecting telescope

Numéro d’image : 12376484
Isaac Newton's reflecting telescope
Whilst the idea of a reflecting telescope was first hypothesised by Galileo and Sagredo, it was Isaac Newton who constructed the first working instrument in 1668. A third instrument was presented to the Royal Society in 1671. Employing a mirror fashioned from a metal alloy (comprising copper, tin and a trace of arsenic) known as speculum, it became possible to observe stars for the first time achromatically so enabling the true colours of the stars to be realised. The making of speculum was a skilled process and probably not done by Newton himself as the proportions of each component is critical to producing a mirror that does not impart a colour to the reflected image. The telescope body comprises velum coated laminated paper glued and rolled into two tubes, one inside the other. The wooden ball mount allows the telescope to be pointed in any direction.
Licence : Droits gérés
Crédit: Science Photo Library / POWER AND SYRED, NASA
Taille de l’image : 4180 px × 4180 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

Prix pour cette image À partir de 45 €

Produit vendu
(Calendrier, Carte postale, Carte de vœux, Impression sur textile, Packaging etc)
À partir de 45 €
Usage commercial
(Affichage, Annonce presse, Annonce TV, Carte, Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 45 €
Éditorial
(Digital, Journal, Livre, Livre pratique, Magazine, Télévision etc)
À partir de 60 €
Usage non-commercial
(Digital - hors rés. sociaux, Digital - rés. sociaux etc)
À partir de 120 €

Mots clés

;