The readiest reckoner ever invented, : for assisting the tradesman, the merchant, the gentleman, &c. in finding the amount, at any given price, of any number from one to ten thousand. ... The whole constructed, and separately calculated, / by Stephen Simpson and Edward Wise, accountants.

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The readiest reckoner ever invented, : for assisting the tradesman, the merchant, the gentleman, &c. in finding the amount, at any given price, of any number from one to ten thousand. ... The whole constructed, and separately calculated, / by Stephen Simpson and Edward Wise, accountants. Public Domain Mark. Source: Wellcome Collection.