B&W view of Needle Telegraph. This device consists of a circular dial with letters and numerals and a needle pointer. On the left is a meter of some type and a switch with handle to select K, T, Z. The numberal 23 is below a pushbubtton.
Verso in German: " Zeigertclegraph, 1847" "Bildarchiv W.-v.-Siemens-Institut, Munchen"