When the Royal Observatory, Edinburgh established its outstation at Monte Porzio Catone just south of Rome, Twiss decided to move his Michelson interferometer there.
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In 1956, Robert Hanbury Brown and Richard Q. Twiss published A test of a new type of stellar interferometer on Sirius, in which two photomultiplier tubes (PMTs), separated by about 6 meters, were aimed at the star Sirius.