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By using a 16-mm film recorded by R. B. Dunn at Sacramento Park Observatory with a 15-in. coronagraph, motions of three solar prominences were studied from the kinematic point of view. Three methods proposed earlier (Billings and Pecker, 1954; Palus, 1972; Makhmudov et al., 1980) were applied to three prominences of the film. A new method based on geometrical considerations is introduced. The results of all four methods are compared and discussed.