Deutsch: Reibungselektrisiermaschine mit Glaszylinder
English: Glass cylinder electrostatic generator. It consists of a rounded cylinder of glass mounted on a shaft turned by the crank at left. The leather pad (center) rubs against the glass, leaving a static electric charge on the glass. A chain hanging against the glass (not visible) usually picked up the charge for use in experiments.
Dmm2va7 put it under the GFDL and CC-BY-SA-3.0. Please note, that there is no right called "Recht am Bild an der eigenen Sache". For more details see this German Discussion