interferometern.

1897 Physical Rev. 4 480 An application of the Michelson ‘interferometer’ to the measurement of the small linear movements of the electrometer disk.

1897 London, Edinb. & Dublin Philos. Mag. 5th Ser. 44 91 To these two methods of measuring angular motions we must now add a third, the interferometer method, first suggested by Michelson.

1899 Ld. Rayleigh in Nature 6 Apr. 533/1 As one of the few who have used the interferometer in observations involving high interference, I should like to make a remark or two.

1899 T. Preston in Nature 6 Apr. 605/2 The ‘structure’ revealed by the interferometer in the light emitted by a source placed in a strong magnetic field.

1921 Discovery July 181/2 Betelgeux, the size of which was measured in December last at Mount Wilson by interferometer methods, has a diameter of 273,000,000 miles.

1932 A. C. Hardy & F. H. Perrin Princ. Optics xxviii. 592 These interferometers are often used in the analysis of a mixture of gases to determine the proportion in which the components are present.

1957 New Scientist 15 Aug. 14/1 At the Cambridge radio-observatory four aerials with a total area of one acre are placed at the corners of a rectangle to form a double interferometer which was used in 1954 to plot the positions of nearly 2,000 radio stars.

1969 C. A. Ronan Invisible Astron. vi. 83 For mapping radio sources..the radio interferometer has become widely adopted. This is based on the same principles as that of the stellar interferometer.., and at its simplest uses two antennae separated by as large a distance as is convenient, the signals being fed into an electronic mixing unit and then passed to the radio telescope receiver.