Print CXX

Yearly migration flows on an equal area projection by occupation, 1981 (Colour).

Lines of more than 0.2% of the geometric mean of the resident populations of the areas of origin and destination are drawn between 9,289 1981 census wards on an equal land area map, coloured according to the mix of occupations at the place of origin software by author on an Archimedes computer.

Here the simple black and white picture of migration is coloured by the general mix of occupations of those living in the ward which is being left. The picture tends to blue as only professionals tend frequently to migrate long distances. The red and orange lines pick out the city centres, while in mining areas such as South Wales, yellow lines are seen.