Diagram of the causes of mortality in the army in the East

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Florence Nightingale's coxcomb plots are one of the earliest examples of a polar area diagram, and a pioneering chart in statistical graphics. This chart shows deaths from preventable diseases in blue, from wounds in red, and other causes in black.
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DIAGRAM OF THE CAUSES OF MORTALITY IN THE ARMY IN THE EAST 2. APRIL 1855 TO MARCH 1856 JANUARY 1856 FEBRUARY MARCH APRIL 1855 MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER 1. APRIL 1854 TO MARCH 1855 JANUARY 1855 FEBRUARY MARCH 1855 APRIL 1854 MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER The Areas of the blue, red & blue wedges are each measured from the centre as the common vertex. The blue wedges measured from the centre of the circle represent area for area the deaths from Preventible or Mutigable Zymotic diseases; the red wedges measured from the centre the deaths from wounds; & the black wedges measured from the centre the deaths from all other causes. The black line across the red triangle in Nov 1854 marks the boundary of the deaths from all other causes during the month. In October 1854, & April 1855; the black area coincides with the red; in January & February 1856, the blue coincides with the black. The entire areas may be compared by following the blue, the red & the black lines enclosing them.