Illustration related to relativity (Figure 18 from publication on Relativity)

Lantern slide showing an illustration related to relativity likely used to accompany a lecture.

The original illustration was published in Frederick William Lanchester's book "Relativity; an elementary explanation of the space-time relations as established by Minkowski and a discussion of gravitational theory based thereon" as figure 18.

Figure 18 shows the algebraic quantity of cosmic velocity plotted on a graph.