The ordinary laboratory routine of labeling kymographic tracings involves at best a rather tedious and arduous task which consists either of holding the hand unsupported well above the carbonized paper and writing upon it with a stylus in the form of some pointed instrument, or writing over the rod of an iron stand or some other inconvenient support for the hand. Furthermore, the carbonized paper must be securely held and especially where there are drafts of air while the labeling is being done, and as a result the fingers become coated with carbon, so that notebooks, clothing, etc., which are handled or touched directly thereafter may become badly smeared and blackened with carbon
