  Astronomical objects frequently exhibit structure over a wide range of scales
whereas many telescopes, especially interferometer arrays, only sample a
limited range of spatial scales. In order to properly image these objects,
images from a set of instruments covering the range of scales may be needed.
These images then must be combined in a manner to recover all spatial scales.
This paper describes the feathering technique for image combination in the
Fourier transform plane. Implementations in several packages are discussed and
example combinations of single dish and interferometric observations of both
simulated and celestial radio emission are given.
