Old used slide rule on squared paper
Size: 3541px × 2360px
Photo credit: © Tromp Willem van Urk / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: add, analog, ancient, antique, arithmetic, background, calculate, calculation, calculator, cursor, divide, divider, education, engineering, evaluate, formula, geek, logarithm, manual, math, mathematics, measure, measurement, mechanical, multiply, nostalgic, number, numbers, object, paper, physics, precision, professional, reading, retro, rule, ruler, scale, school, science, scientific, scientist, sequence, slide, square, squared, statistics, student, vintage, white