instrument for writing without seeing
• (n.) An instrument for writing in the dark, or without seeing.
Scot'o·graph noun [ Greek 
Type: Term Pronunciation: skō′tō-graf Definitions: 1. An appliance for aiding one to write in straight lines in the dark or for aiding the blind to write, as used by the U.S. historian W.H. Prescott. Synonyms: noctograph
scotograph 1. An instrument for recording the size and the form of scotoma or scotomata. 2. An instrument for writing in the dark, or when unable to see.