Roger Hayward
Encyclopedia
Roger Hayward was an American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 artist, architect, optical designer and astronomer. He is the inventor of an early Schmidt-Cassegrain camera that was patented in 1945. He was born on January 7, 1899 to mother, artist Ina Kittredge (Phelps) Hayward and local businessman and time piece hobbyist Robert Peter Hayward. He was the grandson of American landscape artist William Preston Phelps
William Preston Phelps
William Preston Phelps , known as "the Painter of the Monadnock", was an American landscape painter born on the family farm near Chesham, in what is now the Pottersville section of Dublin, New Hampshire on March 6, 1848 to mother Mary Phelps and father Jayson Phelps.-Early years:"Preston", as he...

.
In December 1968 he wrote "Blivet
Blivet
A blivet, also known as a poiuyt, devil's fork or widget, is an undecipherable figure, an optical illusion and an impossible object...

s: Research and Development" to The Worm Runner's Digest in which he presented interpretations of impossible objects.

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