Map of New York City, Showing the Distribution of the Principal Nationalities by Sanitary Districts published in Harper’s Weekly (June 1, 1894) using 1890 U.S. Census data.
This map looks great, revealing a substantial amount of information with its intense, juxtaposed patterns.
The textures on the map show the relative amounts of different nationalities (qualitative data) in each of the areas (sanitary districts) on the map:
The map shows if a district has more or less diversity (more or fewer lines of different textures), the relative proportions of different nationalities, the nationalities themselves, and, at a broader scale, the districts that are similar or differ in their nationality constitution. Because of the careful rotation of the lines of textures, the different sanitary districts can also be distinguished from each other.