ABSTRACT
Centro-symmetric ordering was described as an evolutionary process, but there is always a desire to go beyond description to measurement. Indices of segregation and compactness have been devised, and are discussed by R.W. Thomas (1972, 70-3). Here we are concerned with the outer limits of what could be called the centre, and if a standard methodology can be agreed, certain advantages flow: several cities can be compared, or one city can be compared with itself ac different times. The spatial range of comparison is constricted by the type of data available and the mesh of the grid on which it is collected; unhappily, there is no one method of central city measurement and delimitation that is universally applicable.
