THE suggestion recently put forward 1 that a logarithmic scale should be used for high-vacuum measurements directs attention to the fact that, while increasing use is being made of logarithmic scales ...

“International Critical Tables”, 6, 136, Table 2 (1929). Compton, A. H., and Allison, S. R., “X-Rays in Theory and Experiment”, Table 2, 784, 785 (Van ...