TY - JOUR T1 - The Description of a Floating Collimator JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 115 SP - 147 EP - 178 PY - 1825/01/01/ UR - http://dx.doi.org/10.1098/rstl.1825.0009 M3 - doi:10.1098/rstl.1825.0009 AU - Kater, H. ER -