Abstract
A photoelectric Fabry–Perot interferometer was designed and constructed for the purpose of investigating the internal motions of H II regions too faint to be examined by conventional spectrographs. Details of the technique involved, mode of operation, and preliminary observations on the Orion and Rosette Nebulae are discussed. Initial results show that the technique works successfully and could be used to great advantage on diffuse nebulae of comparable brightness to the Rosette.

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