TY - JOUR T1 - A Letter to Cromwell Mortimer, M. D. Secr. R. S. Containing Several Experiments concerning Electricity; By Mr. Stephen Gray JF - Philosophical Transactions (1683-1775) VL - 37 SP - 18 EP - 44 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1731.0005 M3 - doi:10.1098/rstl.1731.0005 AU - Gray, S. ER -