Kymograph

A kymograph ( "wave recorder " ) is a device for graphically recording a position over time. It consists of a rotating roller with the clamped ( berußtem ) paper with a writing instrument or stylus is moved by changes in position in a sensor mechanism and recording tracks.

The first Kymograph goes back to Thomas Young, who in 1807 in Scripture A course of lectures on natural philosophy and mechanical arts be self- built model presented. Also, the physiologist Carl Ludwig developed a kymograph in the 1840s initially for the purpose of intrusive blood pressure measurement. In addition, the equipment also for recording of muscle contractions and other physiological motion processes, but also the sound analysis were used. In contrast to the phonograph these resulted but not on the Wiederabspielbarkeit, but only to the graphical representation of the sound waves.

Carl Ludwig practiced with his kymographs a great influence on the development of physiology. Within a few years, " a plurality of self -registering devices only by German physiologist, then especially by Marey in France developed and used in physiological research " were.