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Reasoning on the analogy of the distribution of velocities among the particles of a gas on the kinetic theory, which is a very similar problem, Wien was led to assume that the function F should be of the form e−c/λθ, where e is the base of Napierian logarithms, and c is a constant having the value 14,600 if the wave-length is measured in microns μ.

There are two bases of logarithms in common use, the base 10 and the Napierian base e.

In the above formula ε is the base of the Napierian logarithms.

List's patent is for an improvement on the Napierian system and was granted in 1891.

I repeated, quoting my favourite Napierian motto again.