Smoking device

 

On the smoking device the paper rolls are being prepared for registration on Wiechert seismographs - the surface of the paper is covered with a thin uniform layer of soot. The stylus of the seismograph scratches the soot off the smoked paper with its fine tip thus recording the movement of the Earth. In this way the friction between the tip of the pen and the paper is minimal.

 

 

Burner frame

The flame of the butane burner grasps the paper-roll along all its width and covers it with soot. The paper roll is stretched between two cylinders which enables the rotating of the paper so that it doesn’t burn out. The good soot quality is obtained by the passage of the butane through benzene.

 

 

Fixing frame

The recorded paper-roll  is stretched between two cylinders. The lower cylinder together with the diagram part is immersed into shellac. By rotation of the cylinder the whole diagram is dipped into shellac. After drying the valuable trace in soot is permanently preserved.