Lest Darkness Fall
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Lest Darkness Fall is a 1939 alternate history science fiction novel by the American author L. Sprague de Camp. Lest Darkness Fall is similar in concept to Mark Twain's A Connecticut Yankee in King Ar
Dust cover of first edition
Double-entry bookkeeping
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Double-entry bookkeeping, also known as double-entry accounting, is a method of bookkeeping in which every financial transaction is recorded with equal and opposite entries - thus "balancing the books
Lest Darkness Fall
…He persuades a banker, Thomasus the Syrian, to lend him seed money to start his endeavor. He teaches his and Thomasus's clerks Arabic numerals and double entry bookkeeping. He eventually develops a printing press, issues a newspaper, and builds a crude semaphore telegraph system utilizing small telescopes. However, he…
Della mercatura e del mercante perfetto by Benedetto Cotrugli, cover of 1602 edition; originally written in 1458