Ottonis de Guericke Experimenta nova (ut vocantur) Magdeburgica de vacuo spatio
Apud Joannem Janssonium à Waesberge, 1672
55. First Rotary Generator
This work (which appears twice in this list) is critical because of its description of the first electric rotary generator. Guericke invented this device that produced static electricity by generating friction against a moving ball of sulfur. This copy was once owned by the noted book collector, Herbert McLean Evans. Also included in the Electricity & Magnetism Section, this work describes Guericke's famous 1654 experiment of the "Spheres of Magdedburg." In this experiment he dedemonstrated how two teams of horses could not pull apart two copper hemispheres that had the air evacuated from their interior and were only held together by air pressure.