<P> An English physicist Henry Kater was the inventor of the floating collimator , which rendered a great service to practical astronomy . He reported about his invention in January 1825 . In his report , Kater mentioned previous work in this area by Carl Friedrich Gauss and Friedrich Bessel . </P>
<P> An English physicist Henry Kater was the inventor of the floating collimator , which rendered a great service to practical astronomy . He reported about his invention in January 1825 . In his report , Kater mentioned previous work in this area by Carl Friedrich Gauss and Friedrich Bessel . </P>
who designed a pinhole gamma ray called the collimeter
who designed a pinhole gamma ray called the collimeter
English physicist Henry Kater
English physicist Henry Kater