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Directory Results for MEASUREMENT VERSUS PREDICTIONS OF ROTORDYNAMIC COEFFICIENTS AND LEAKAGE RATES FOR A HOLEPATTERN GAS SEAL WITH NEGATIVE PRESWIRL A Thesis by PHILIP DAVID BROWN Submitted to the Office of Graduate Studies of Texas A&amp to Measurement Vertex Position of a Large Aspheric Mirror. We present a novel method to accurately measure the vertex position of a large aspheric mirror with a phasing measuring interferometer, a laser tracker, and a micro alignment telescope. The