 The tape was liable to snap, particularly at joins, which at 1.5 metres/second could rapidly cover the floor with loops of the sharp-edged tape.Rewinding was done at twice the speed of the recording.However, despite all this, the ability to make replayable recordings was extremely useful, and even with subsequent methods coming into use (direct-cut discs and Philips-Miller optical film) the Marconi-Stilles remained in use until the late 1940s.