A2 practical: Spinning stopper example results
It took some time to master the technique so the first 4 or 5 attempts were ignored. After a while I found it quite easy to maintain a constant rhythm. A piece of sticky tape was used as a marker to help keep the string at a fixed length, this was set at an approximate position then the string measured and adjusted to the nearest cm. The length was measured to the nearest point of the stopper. The stopper was always...