Waves always behave in a similar way whether Home Page they are longitudinal or transverse, elastic or Title Page electric. Scientists of last century always kept Contents this idea in mind. .. This general philosophy of wave propagation, forgotten for a time, has been → strongly revived in the last decade Go Back Brillouin(1946) Full Screen CloseHome Page Title Page Contents JJ II J I Page 7 of 41 Go Back Full Screen Close Quit Waves always behave in a similar way, whether they are longitudinal or transverse, elastic or electric. Scientists of last century always kept this idea in mind · · · . This general philosophy of wave propagation, forgotten for a time, has been strongly revived in the last decade · · · — L. Brillouin (1946)