Word: refleflctor
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...miles Northeast of Cambridge. Oak Ridge's facilities, many of which were moved from Cambridge when the northward spread of the city rendered the old location not sufficiently free from dust and artificial lights to permit optimum conditions for astronomical observation, includes a 16 inch doublet, a 24 inch refleflctor, and a 61 inch telescope with spectroscopic equipment. Oak Ridge is now the Department's headquarters for systematic photographing of the Northern...
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