Data Collection

John Snow Cholera Map

The visualisation that helped identify why there was a cholera outbreak in London.

A map taken from a report by Dr. John Snow. Wellcome Collection. Public Domain Mark

In 1854 John Snow’s visualisation of a cholera outbreak in London helped identify that the outbreaks were clearly related to water pumps.

The original map can be found at the link below:

https://wellcomecollection.org/works/uxgfjt62