Echoing other comments about the slide rule caption. I know. I was there. It was the other PC -- the Pocket Calculator, and especially the HP's - that killed the slide rule. A slide rule carried me through high school and first two quarters at Georgia Tech. In spring quarter, I borrowed my better-heeled roommate's Texas Instruments SR-10 ($155 at the time) for a self-study physics course. It was great, but I still used the slide rule for other courses. That fall, In the first class of an energy/mass balance course, the professor explained his grading system - 9 of 10 points for getting the solution in the form "X= blah, blah" with all the right numerical values in the "blah, blah" side. One point for the numerical answer. He then suggested that meant that those with electronic calculators probably had a nominal letter grade advantage over those still using slide rules. Within a week I purchased an HP-35 ($300). I continued to carry a circular slide rule as a backup, but that class was the end of my routine use of slide rules. That was fall of 1973, well before the popularization of the personal computer.