The orchestra bells (or "chimes," if you go by Wurlitzer catalogue description) provide a beautiful accent to the music. This striker action has been modified to conform with the later style Philipps bell actions, with a set of internal control valves, which provide a very precise and quick acting response. Originally the bells were silenced by a thick felt curtain that dropped down between the actual bells and the row of pneumatically operated strikers. This clumsy arrangement was soon dropped in favor of a more effective design.