Which of these mathematical tools was first marketed by the Keuffel & Esser company in 1886, becoming so ubiquitous in engineering and mathematics that it was considered essential until electronic calculators emerged?

Before advanced calculators and computers, mathematicians relied on various tools to perform calculations. Some of these tools revolutionized education, research, and practical applications in mathematics. This poll explores the market impact and historical significance of one such iconic product that transformed how we approach mathematical operations.

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The logarithmic slide rule
The mechanical abacus
The Curta mechanical calculator
The Brunswiga adding machine