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