slide rule sliding rule red pencil on graph paper scale paper

Size: 5617px × 3759px
Photo credit: © superclic / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ancient, arithmetic, blue, calculation, construction, count, counting, counts, design, device, effect, graph, light, lighting, math, mathematics, nostalgia, nostalgic, paper, pen, pencil, red, rule, slide, sliding, stills, technology