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uploads/railroad flat.jpg

railroad flat (沒有各間分別進出的走廊的)一間接一間的套房,列車式套房...

railroad spike

To work out a mathematical relationship of the “ dopplereffect ” , relating the pitch to the relative motion of source andobserver , the austrian scientist christian johann doppler placedtrumpeters on a railroad flat car and musicians with a sense ofabsolute pitch near the tracks . a locomotive engine pulled theflat car back and forth at different speeds for two days . themusicians on the ground “ recorded ” the trumpet notes as the trainapproached and as it receded 為了計算出“多普勒效應”的一個數學關系,即音調和運動中的聲源和觀察者之間的相對關系,奧地利科學家克里斯蒂?約翰?多普勒讓幾位吹號人坐在一節平板火車上,讓幾個對音調特別敏感的音樂家坐在鐵軌附近。