By Alec Eden
It is now a hundred and fifty years in the past, on twenty fifth could 1842, that the son of a Salzburg ston emason provided a systematic paintings "On the colored gentle of the double stars and sure different heavenly our bodies" at a gathering of the Royal Bo hemian Society of Sciences held in Prague. Christian Andreas Doppler, then professor on the Prague Technical Institute, set a milestone in scien tific background within the assembly room of the Royal Society within the Charles Uni versity, quite a few meters from the nationwide Theatre the place one other genius from Salzburg, Wolfgang Amadeus Mozart, had celebrated his musical triumph with the most excellent of his opera Don Giovanni fifty-five years previous. Doppler's lecture set out in significant simplicity what we now name the Doppler precept, which seeing that has chanced on quite a few makes use of in astronomy, which was once of basic curiosity to Christian Doppler. furthermore, it has chanced on numerous functional functions in physics, navigation, aeronautics, geodesy, drugs, technology and expertise. In medication by myself, Doppler sonography is now a longtime diagnostic method within the fields of childbirth, cardiology and illnesses of the blood vessels, neurology, neuro surgical procedure and vascular surgical procedure, and is consistently discovering new clinical appli cations in state-of-the-art international of excessive technology.