TheCodeBreakers
that powerfully gripped the imagination of a war-weary world. Another
indication came when Japan suddenly introduced a new
code, the YU, for their most secret messages. On solution, it was
dubbed "Jp"—the sixteenth solved since Yardley's original break.
A few months before the November opening of the disarmament
conference in Washington, daily courier service was set up between the
Black Chamber and the State Department. An official grinningly
remarked that State's upper echelons were delighted with the cryptan-
alysts' work and read the solutions every morning with their orange juice
and coffee. The conference sought to limit the tonnage of capital ships,
and as negotiations were proceeding toward its chief result—the Five-
Power Treaty that accorded tonnages in certain ratios to the United
States, Britain, France, Italy, and Japan—Yardley's team was reading the
secret instructions of the negotiators
annaabi.ee 
