He apparently had a prototype of his machine working ' early in 1940 ' .
Atanasoff contemplated storing the coefficients of an equation in capacitors located on the periphery of a cylinder .
Atanasoff apparently had a prototype of Atanasoff 's machine working ' early in 1940 ' .
Atanasoff contemplated storing the coefficients of an equation in capacitors located on the periphery of a cylinder .