A compilation of 21 cm line spectral parameters specifically designed for a
pplication of the Tully-Fisher (TF) distance method is presented for 1201 s
piral galaxies, primarily field Sc galaxies, for which optical I-band photo
metric imaging is also available. New H I line spectra have been obtained f
or 881 galaxies. For an additional 320 galaxies, spectra available in a dig
ital archive have been reexamined to allow application of a single algorith
m for the derivation of the TF velocity width parameter. A velocity width a
lgorithm is used that provides a robust measurement of rotational velocity
and permits an estimate of the error on that width taking into account the
effects of instrumental broadening and signal-to-noise. The digital data ar
e used to establish regression relations between measurements of velocity w
idths using other common prescriptions so that comparable widths can be der
ived through conversion of values published in the literature. The uniform
H I line widths presented here provide the rotational velocity measurement
to be used in deriving peculiar velocities via the TF method.