A kind of writing-frame for a blind or partially-sighted person.
Invented by Ralph Wedgwood. Best known because of its use by the American historian William H. Prescott (1796–1859).
Mid 19th century; earliest use found in George Ticknor (1791–1871). From nocti- + -o- + -graph. Compare French nyctographe machine enabling the blind to write or the sighted to write in the dark.