TY - JOUR T1 - On the Methods of Cutting Rock Crystal for Micrometers JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 110 SP - 126 EP - 131 PY - 1820/01/01/ UR - http://dx.doi.org/10.1098/rstl.1820.0008 M3 - doi:10.1098/rstl.1820.0008 AU - Wollaston, W. ER -