English: Mechanical equality and mechanical spacing are foreign to correct lettering. The letters of figure 4 demonstrate this. All the letters in that case are equal in width and are spaced equally apart. The trouble is obvious. Hence, the necessity of assigning different and specific widths to all letters. Figure 5 shows the same letters as in figure 4, but with their proper relative widths and spacing apart. They present, therefore, a much more satisfactory appearance.