This schem shows the physical structure of a tape head.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: vectorization, translation
<a href="//commons.wikimedia.org/wiki/File:Cabe%C3%A7a_magn%C3%A9tica.JPG" title="File:Cabeça magnética.JPG">File:Cabeça magnética.JPG</a> by <a href="//commons.wikimedia.org/w/index.php?title=U:Frajolex&amp;action=edit&amp;redlink=1" class="new" title="U:Frajolex (page does not exist)">u:Frajolex</a>