However, it is the last graphic – the successor to the “bat’s wing” which I will call the “wedges” – that Nightingale is most famous for. Strangely enough, the name that many people give it is wrong. This graphic is not what Nightingale referred to as the “coxcomb”!
In this diagram, Nightingale resolved the problem of the “bat’s wing” by using areas to represent the variation in the death rate, instead of the length of radial lines. The blue wedges, representing death by sickness, are far bigger than those representing wounds. The message of this graphic is twofold: first, most of the fatalities during the war were from sickness and second, improvements in hygiene dramatically reduced the death rate.
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See the full-size 1858 graph at Wikipedia.