R. W. WOOD 1 has described an interesting discharge tube which could be made to exhibit “either the spectrum of atomic hydrogen or molecular oxygen at will” on excitation by a high-frequency discharge ...

WHEN ammonia is passed through a discharge tube, under the same conditions as used to prepare atomic hydrogen, an active gas is obtained. This active gas is reducing in character as shown by the ...

With all the new, innovative types of components we see, it's interesting to note which “new” devices we routinely use are really updated versions of classics from the early days of electrical design.