Part 47

United States Military Intelligence, 225, 226

Vacuum tubes, 81, 286

Venetians, 195

Ventilation, 13

Verne, Jules, 143

Vestal Virgins, 42

Volcanoes, 166

Volta, 111, 112, 127

Voltaic pile: construction of, 111, 127

Von Bolton. See Bolton.

War: and artificial light, 11, 178-193

Washington, 305

Water: sterilization of, by artificial light, 280 et seq.

Watson, Dr. Richard, 67, 68

Watt, 94

Waves: electro-magnetic, 68, 86, 125 et seq.

Wax, 34, 46, 51

Way: mercury-arc produced by, 124

Wells, 61

Wells, H. G., cited, 148

Welsbach, Auer von: 61; invention of mantle by, 99, 100, 133

Wenham, 78

West Indies, 25

Whale-oil, 31

Wicks, 35, 36, 53, 54, 58, 59

Winsor, 72, 73. See also Winzler.

Winzler. See Winsor.

Wolfram. See Tungsten.