With crystals we are in a situation similar to an attempt to investigate an optical grating merely from the spectra it produces... But a knowledge of….

For in 1900 all electromagnetic radiation of longer wavelengths was already known at least to the extent that one could not seek in it the more strik….

For as long as one has no further point of reference, apart from the position of the maximum, the wavelength thus remains uncertain by an integral fa….

Notwithstanding these major arguments the wave theory initially did not meet with complete acceptance..