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Of his noctograph Prescott made constant use.

And so, after a little time, he went on as before, studying "by ear-work," and turning off upon his noctograph from ten to fifteen pages every day.

Prescott then placed his noctograph upon the floor and lay down flat beside it, writing in this attitude for many hours on nine consecutive days rather than give in.

On October 6, 1829, after three months devoted to reviewing his notes for the opening chapter, he took his noctograph and scrawled the initial sentence.

It was a contrivance called "the noctograph," meant for the use of the blind.