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