JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Mobile telephone. Conceptual image of a phrenology head using a cellular or mobile telephone. These telephones use low-power radio signals to transmit calls to a base station in the user's local area, or cell. A wide range of frequencies can be used in each cell because the signals are too weak to interfere with those in other cells. Base stations relay calls by cables to switching centres, from where calls can be transferred to other base stations, to the conventional telephone exchange, or to satellite stations for international calls. Phrenology was a popular nineteenth century pseudo-science in which character was thought to be linked to the shape and size of the skull.
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