# Page:Ueber das Doppler'sche Princip.djvu/11

If, for example, we have ${\displaystyle {\overline {\delta }}=f(t)}$ on a very small sphere of radius R, then the propagated dilation is given by:
${\displaystyle \delta ={\frac {R}{r}}f\left(t-{\frac {r-R}{\omega }}\right).}$