J. Orton
New York: [Publisher as printed], 1870
Hardcover.
Orton’s Lightning Calculator and Accountant’s Assistant
A late-19th-century computational manual designed to assist merchants and clerks in rapid arithmetic calculation. Prior to widespread mechanical calculators, such volumes provided standardized tables and shortcuts for interest, percentages, and commercial transactions.
Works of this type were heavily used in daily bookkeeping and office practice, often resulting in significant wear or loss. Surviving examples offer direct evidence of pre-electronic commercial mathematics.
Notable Features
1870 edition
Pre-mechanical calculation reference
Commercial mathematics manual
Original cloth binding
Condition
Good
Why This Book Matters
Manual calculation guides represent a vanished phase of commercial practice. They document the tools of trade prior to adding machines and digital accounting.
J. Orton
New York: [Publisher as printed], 1870
Hardcover.
Orton’s Lightning Calculator and Accountant’s Assistant
A late-19th-century computational manual designed to assist merchants and clerks in rapid arithmetic calculation. Prior to widespread mechanical calculators, such volumes provided standardized tables and shortcuts for interest, percentages, and commercial transactions.
Works of this type were heavily used in daily bookkeeping and office practice, often resulting in significant wear or loss. Surviving examples offer direct evidence of pre-electronic commercial mathematics.
Notable Features
1870 edition
Pre-mechanical calculation reference
Commercial mathematics manual
Original cloth binding
Condition
Good
Why This Book Matters
Manual calculation guides represent a vanished phase of commercial practice. They document the tools of trade prior to adding machines and digital accounting.
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