  English Translation of Paul Drude's 1902 investigation into the factors affecting the self-resonance of single-layer solenoid coils. The ratio of the self-resonant half-wavelength to the conductor length is is found to be principally dependent on the height-to diameter ratio of the coil and the dielectric constants of any insulating materials involved in the construction. 
On the construction of Tesla transformers. Period of oscillation and   self-inductance of the coil. (Zur construction von Teslatransformatoren.   Schwingungsdauer und Selbstinduction von Drahtspulen)