13.The parting in his short gray hair was almost unnaturally straight, and his narrow toothbrush mustache looked as though he trimmed it using a slide rule.
16.The guy with blueprints; the guy in a three-piece suit; the guy with a slide rule and calculator; the guy that's going to pave the forest and perhaps destroy whole ecosystems.
17.So, the calculator–the thing that we might recognize as a calculator–kind of has to have a different form because the slide rule's form isn't cutting it.
18.So, prior to the slide rule, we had to calculate logs using these long charts known as " log tables." So, the basis behind the slide rule were these very, very long books of incredibly accurate logarithmic tables.
19.Fundamentally, if you're going to be doing a lot of calculations with a slide rule, everything has to be linear, by which I mean most equations need to just be multiplications or divisions or just adding some constant number.