The Master Key (Baum novel)

Rob is an electrical experimenter whose father encourages him and sees that he "never lacked batteries, motors or supplies of any sort."

Over the next two weeks, Rob experiences adventures exploring the use of the Daemon's gifts, but eventually concludes that neither he nor the world is ready for them.

On the third week, Rob rejects the Daemon's gifts and tells him to bide his time until humankind knows how to use them.

In 1901, The New York Times ran a brief notice calling it "a story for boys—all boys who love good wholesome adventure and exciting incident.

It is a strange story of the electrical Daemon, treating of powers that dominate all nature, and written for the eager, alert, and striving American boy.