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The wavelength of a wave guided by a dielectric rod has been measured for the TEon, TMon, HEln, and EHln, modes for n = 1 and 2. The measurements were made on polystyrene, lucite, textolite, and paraffin rods, as well as on plastic tubes filled with Nujol and dioxane. The measurements agree very well with the solutions of the characteristic equation. The solution of the characteristic equation corresponding to the second radial mode and the angular mode of order one has two branches, both of which are found experimentally. Measurements are made of the attenuation in a dielectric rod due to losses in the dielectric and due to bending of the dielectric guide.