John Wall (inventor)
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Crayford, Kent, England)
|Significant design||Crayford focuser|
|Significant advance||dialyte based refracting telescopes|
John Wall's aptitude for engineering won him an apprenticeship with Vickers Armstrong at the age of sixteen in the town of Crayford where he was born. He served in the army with the Royal Electrical and Mechanical Engineers in early 1950s and there became interested in telescopes and astronomy. He went on to become a design engineer at Vickers and, while working there in 1969, came up with the idea for an accurate mechanically simple eyepiece mount for amateur telescopes, the Crayford focuser. He is also known for designing dialyte based refracting telescopes, coming up with the Zerochromat retrofocally corrected refractor, including a folded 30-inch f/12 version he built in 1999.
30-inch dialyte refracting telescope
- A New Refractor Concept: "The Wall Hypochromatic Refractor"
- The John Wall 30-inch refractor.
- The Crayford eyepiece mounting by John Wall - Journal of the British Astronomical Association, 81 (2), 118, February 1971
- Crayford focusers
- Crayford Eyepiece Mount
- astronomics.com's description of how the Crayford Focuser works
- Toshimi Taki's description of how to build a cheap Crayford Focuser[permanent dead link]