Metals, the different conductivity of various 50–55
Michel (R. F.), his modified terminal-rod 132
Mineral oil-tanks, the protection of, from lightning in America 138
Monks, Carthusian, electrical experiments made on 6
Musschenbroek (Peter Van), his researches on electricity 4, 5
Newall (R. S., F.R.S.), his copper-rope manufactory 110, 142 ———— on the church at Laughton-en-le-Morthen being struck by lightning 153, 154
Newall’s system of protecting buildings from lightning 140 ———— copper-rope conductors 162, 164
Newbury Church, Massachusetts, struck by lightning 27
New River, electrical experiments made on the 8
Newton (Sir Isaac), his electrical machine 2
Nollet (Abbé), his criticisms on Franklin’s electrical experiments 19, 35 ———— his animadversions on lightning-conductors 35, 37 ———— Franklin’s reply thereto 36, 37
Oersted (Hans Christian) his researches in electro-magnetism 55, 57
Ohm (Professor), his experiments on the conductivity of metals 53
Oil, mineral, tanks, the protection of, from lightning in America 138
Orsini family and lightning-conductors 64
Oxford, Merton College Chapel struck by lightning 182
Padua, the first lightning-conductor in 48
Paratonnerres, the Paris Academy ‘Instruction’ on 75
Paris Academy, the ‘Instruction’ of the, on lightning-conductors 75
Paris, death of two persons by the fall of a ‘tige’ from steeple of St. Gervais 146
Peltier (Jean Athanase), his researches in electricity 71
‘Physico-mechanical experiments,’ Hauksbee’s 3
Pliny the Elder, on the observation of thunderstorms 62
‘Points _v._ balls,’ the controversy of 40
‘Poor Richard’s Almanac’ and lightning-conductors 28
Pope, the, on electrical experiments on monks 7
Pouillet (Professor Claude), his experiment on the conductivity of metals 54 ———— on lightning-conductors 78
Powder-magazines in France, the protection of, from lightning 82 ———— Sir William Snow Harris’s instruction for protecting 93
Pringle (Sir John) his resignation of the Presidency of the Royal Society in 1777 41
Protestantism and lightning-conductors 43
Prussia, statistics of deaths from lightning in 170
Purfleet, building struck by lightning in 1777 41
Rarefied air, the conductivity of 142, 149
Raven (Mr.), his house in Carolina, U.S., struck by lightning 159 ———— Arago’s comments thereon 159
