Trammell HudsonSlide rule fans: have you ever seen one with two cursors and a second sliding rule? This odd sliderule illustration was on the cover of Astounding Science Fiction, May 1951 https://archive.org/details/Astounding_v47n03_1951-05_Sam_Hall/mode/2up
Marcus Müller@th I've seen one with one cursor and an inner slide like yours. I don't remember what the special purpose was, or whether it was just missing the second cursor