When Mr. Johnson felt his fancy, or fancied he felt it, disordered, his constant recurrence was to the study of arithmetic, and one day that he was totally confined to his chamber, and I inquired what he had been doing to divert himself, he showed me a calculation which I could scarce be made to understand, so vast was the plan of it, and so very intricate were the figures: no other, indeed, than that the national debt, computing it at one hundred and eighty millions sterling, would, if converted into silver, serve to make a meridian of that metal, I forgot how broad, for the globe of the whole earth, the real globe.
-Mrs. Thrale’s Anecdotes
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