TY - JOUR T1 - An Explanation of an Instrument for Measuring Small Angles, the First Account of Which Was Read before the Royal Society May 10, 1753. By Mr. John Dollond. In a Letter to James Short, M. A. and F. R. S. JF - Philosophical Transactions (1683-1775) VL - 48 SP - 551 EP - 564 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1753.0074 M3 - doi:10.1098/rstl.1753.0074 AU - Dollond, J. ER -