2. Wayne Stuart constructed a frame apparatus that housed both string types, Roslau and Paulello, each with their respective agraffe and pinned coupling, at the precise height to be stuck from underneath in the upward direction by a moveable piano hammer action, activated by a piano key. The apparatus also enabled clear sight lines of the string vibrations for detailed filming. Wayne Stuart supplied the moveable key-hammer action.
3. Hideki Isoda, head of the audio and visual technological department at the Sydney Conservatorium of Music filmed the strings on a Sony PMW EX1R XDCAM EX Full HD Memory Camcoder, with the capability of slowing the footage down.

The movie clip below was shot by the Sony PMW EX1R XDCAM EX Full HD Memory Camcoder camera, and slowed down in the replay. Aswe had only one striker, this video is cleverly edited to show both string reactions simultaneously. The footage illustrates the behaviour of the Roslau- Steinway, copper wound string on the left side, the Paulello-Stuartstainless steel wound string on the right side, as they are struck with the same force, at midi calibration 81 ff .

To watch the String Vibration Test movie clip double click on:String Vibration test .mov,