John Wall (inventor)

John Wall (26 June 1932 – 27 January 2018) was an English design engineer, amateur astronomer, and amateur telescope maker. He was a  member of the British Astronomical Association until his death in 2018. He was known for designing dialyte based refracting telescopes, coming up with the Zerochromat.

Wall died on 27 January 2018 in Coventry, Warwickshire at the age of 85.

References

Other websites
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 

Category:1932 births
Category:2018 deaths
Category:British  engineers
Category:English inventors
Category:English astronomers
Category:People from Kent