Displaying 31 - 40 of 1641
Object, Instrument, Technology

This apparatus consists of three wires, each bent to resemble transverse waves. The wires are mounted in a rectangular brass box that was placed in front of the lens of a projector. The top two wires are identical, but positioned so that their shadows appear to move in opposite directions as a crank on the side of the box is turned. As they do this, the crests and troughs of the waves alternately lineup and overlap. The corresponding “interference” of the two waves is seen in the changing shape of the third wire.

Object, Instrument, Technology

“Schwellen-Audiometer, Clamann & Grahnert Dresden, made in Germany, DDR.“ See also New Psychological Apparatus, II: An audiometer

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

Ear model from the Charité Collection at Berliner Medizinhistorisches Museum der Charité.

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

See also Tuning fork

Picture: Max-Planck Institute for the History of Science

Object, Instrument, Technology

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

See also Phonograph

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

Picture: Max Planck Institute for the History of Science

Object, Instrument, Technology

Inscription: VEB Funkwerk Leipzig, VVB-RE7, Kondensator-Mikrofon, Typ CM 7151.

Picture: Max Planck Institute for the History of Science

Image
“Condenser Microphone From The Charité Collection”. 2018.
Object, Instrument, Technology

Picture: Max Planck Institute for the History of Science