slave of the lamp

In the eyes of Gorgias "the word" was a despot who could do anything, but like a slave of the lamp it would be at the service of those who took his courses.

The miracles wrought by this slave of the lamp transcend all the wonders conceived by the oriental romancists.

These "slaves of the lamp," as they used to be called, owing to the flash-light instrument upon which they sent the messages, had an equal number of hours on and off duty, and in their leisure hours spent their time in boating.