Dated 1852-1870. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Three cryptographs devised by Wheatstone including one wooden prototype with letters and numerals on circular cards attached to a square wooden base; two in original cases with nickel-silver dials,  hands and circular removable cards  for assigning the code.  The dials are inscribed ‘The Cryptograph, C. Wheatstone Invr.’.  Cipher post designed by Wheatstone, consisting of a small brass post with rings of letters and numerals on a mahogany base.