TheCodeBreakers
house at 15th and M Streets barely ready for occupancy, and then to a
building on the site of what is now the Capitol Theatre on F Street, all in
Washington. For security, its offices were always on the top floor.
Growth continued apace. An intercepted letter in a German shorthand
instigated a shorthand subsection that soon could read missives in more
than 30 systems, most commonly Gabelsberger, Schrey, Stolze-Schrey,
Marti, Brock-away, Duployee, Sloan-Duployan, and Orillana. A blank
piece -ef paper discovered in the shoe heel of a woman suspected of
working with German espionage in Mexico turned out to bear a message
in invisible ink. Fortunately, it proved one of the simpler kinds, which
can be developed by heat. But it sparked the establishment of a secret-
ink subsection whose expert chemists could detect writing in an invisible
ink disguised as a perfume with an actual odor and with only one part in
10,000 of solid matter.
annaabi.ee 
