Found on the Steno Museum Collections website. Although this kymograph was used to measure the effect of medications on muscle contraction it is much the same as the smoked-drum kymographs used on spirometers during the late 1800’s and early 1900’s. This was manufactured by Palmer of England, probably in the 1920’s or 1930’s.
“The black drum is prepared as follows: A piece of strong, glossy graph paper tightened on the drum. The drum is rotated through a strong sooty flame (gas bubbled through toluene). During the experiment the sooty drum rotates a predetermined speed which is selected on the kymograph gear. After trying out the sooty paper is carefully removed from the drum and fixed with dammar resin dissolved in gasoline.”