Smyth 's Parallactic Ladder mount 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 Descriptive and Practical Astronomy by G F Chambers.
RMID:Image ID:HWREKW
Image details
Contributor:
Lebrecht Music & Arts / Alamy Stock PhotoImage ID:
HWREKWFile size:
50 MB (2.9 MB Compressed download)Releases:
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4083 x 4280 px | 34.6 x 36.2 cm | 13.6 x 14.3 inches | 300dpiDate taken:
21 March 2017Photographer:
LebrechtMore information:
This image could have imperfections as it’s either historical or reportage.