56

Elaborate fixtures of the age of candles 57

Flame arc 128

Direct current arc 128

On the testing-racks of the manufacturer of
incandescent filament lamps 129

Carbon-dioxide tube for accurate color-matching 160

The Moore nitrogen tube 160

Modern street lighting 161

A completed lighthouse lens 176

Torro Point Lighthouse, Panama Canal 176

American search-light position on Western Front in
1919 177

American standard field search-light and power unit 177

Signal-light for airplane 232

Trench light-signaling outfit 232

Aviation field light-signal projector 232

Signal search-light for airplane 232

Unsafe, unproductive lighting worthy of the dark ages 233

The same factory made safe, cheerful, and more
productive by modern lighting 233

Locomotive electric headlight 240

Search-light on a fire-boat 240

Building ships under artificial light at Hog Island
Shipyard 241

Artificial light in photography 256

Sterilizing water with radiant energy from quartz
mercury-arcs 257

Judging color under artificial daylight 272

Artificial daylight 273

Fireworks and illuminated battle-fleet at
Hudson-Fulton Celebration 288

Fireworks exhibition on May Day at Panama-Pacific
Exposition 289

The new flood lighting contrasted with the old
outline lighting 304

Niagara Falls flooded with light 305

Artificial light honoring those who fell and those
who returned 320

The expressiveness of light in churches 321

Obtaining two different moods in a room by a portable
lamp which supplies direct and indirect components
of light 336

The lights of New York