Smyth's parallactic ladder framework

Numéro d’image : 11637139
Smyth's parallactic ladder framework
Smyth's parallactic ladder mount,details of the frame. This device was devised by the British optician and instrument maker George Dolland (1774-1852) and presented to the British astronomer William Henry Smyth (1788-1865). Its function was to act as an equatorial mount for portable telescopes,and to be cheaper and easier to construct than fixed mounts. The telescope would be moved by hand in the cradle,rather than moved by machinery. Artwork from 'A Handbook of Descriptive and Practical Astronomy' (1890,4th edition,volume II) by British author George Frederick Chambers (1841–1915)
Licence : Droits gérés
Crédit: Science Photo Library / Royal Astronomical Society
Taille de l’image : 3349 px × 5277 px
Model Release : Non requis
Property Release : Non requis
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