-For concave mirrors, LCO tests most frequently with knife-edge/zonal testing, also known as Foucault testing, to measure the correction of a mirror. We have found, and it has been verified with state-of-the-art, very accurate modern testing systems, that, even for fast mirrors, the zonal...
that brought me to fill a place in Uncle Sam's brick edifice, when I might as well, or better, have gone somewhere else. My doom was on me. It was not the first time, nor the second, that I had gone away,--as it seemed, permanently,--but yet returned...