Product images of Newtonian primary mirror
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Manufactured in the UK
All products are printed in the UK, using the latest digital presses and a giclée printmaking process.
We only use premium branded inks, and colours are independently verified to last between 100 and 200 years.
Newtonian primary mirror
A Newtonian primary mirror of speculum metal with a focal length of 313.06cm. The mirror is very smooth and regular but for a prominent zone of short focus whose radius was about 2/5 that of the whole mirror. There is also a small spot of short focus at the centre. The whole mirror appeared under the knife-edge to be of nearly spherical figure, or perhaps very slightly parabolic.
Sir William Herschel
- Image reference: F3364
- National Maritime Museum, Greenwich, London, Herschel Collection