Gray, Andrew The theory and practice of absolute measurements in electricity and magnetism 2 volumes Andrew Gray - London Macmillan 1893 - xx+868p. appendix; figs; index 000049A: v. 1; 000049B: v. 2, part 1 and 000049C: v. 2, part 2 Subjects--Topical Terms: ElectricityMagnetism Universal Decimal Class. No.: 537+537.6.08 / GRA