The source of the image was a glass slide, backlit by an arc lamp.
A drawback of that technology is the warm up time required for arc lamps.
He coined the term arch lamp, which was contracted to arc lamp when the devices came into common usage.
Xenon arc lamp: this is the most common type of lamp both for continuous and flashed solar simulators.
These larger ones used a carbon arc lamp as their light source with a diameter of 20 inches (50 cm).
These powered an arc lamp in the lighthouse, with a three-wick paraffin lamp kept lit but turned down in case the electric lamp failed.
Typical arc lamps operate at a voltage high enough to maintain the certain current level for which the lamp was designed to operate.
Therefore, his disquisition as to the reason for arc lamps vanishing from the streets is wrong technically.
