Reis Telephone
-Johann Philipp Reis created the Reis Telephone in October 1861.
-He constructed it by winding a coil of wire around an iron knitting needle and connecting that to a series of electrical boxes.
-It required very high current and produced weak sound that was a clicking.
-The receiver was very insensitive and was a current-sensitive device rather than a voltage-sensitive device.
Source: http://en.wikipedia.org/wiki/Reis_telephone, 11/18/2014.
Link to the rest: https://docs.google.com/presentation/d/15k5j28d-Q3xIaj4UA4DxlPoO4jWYY10G6Dz0xvkpIRo/edit#slide=id.g4c3bb3d42_10
