As I struggled to complete my thesis research, for advanced degrees in electrical engineering at MIT (1927 and 1931), little did I realize that two important developments of considerable engineering application were in their embryonic stages, and I was right on the cutting edge of both. These were (1) the first practical analog computer?"' with the capability to solve nonlinear differential equations and (2) the strobe light,5-7 which gives ample light to record rapidly moving mechanical motions. These two devices were used together as a system to study the transient performance of synchronous machines for my graduate studies. I must say that they did it well for many years.