D3.js visualization of the famous polar area diagram from Florence Nightingale's "A contribution to the sanitary history of the British army during the late war with Russia".

Two works served as the inspiration for this implementation:

• Mike Bostock's protovis implementation
• Understanding Uncertainty's flash implementation

A few comments. Bostock's implmentation, while visually similar to Nightingale's visualization, is wrong. First, the data is not correct. You can verify this in Nightingale's original work. Second, Bostock directly maps the wedge radius to deaths. This mistake is common. Instead, Nightingale represents deaths in terms of area, thus requiring the radius for each