"These forces, operating in all directions, absolute and immutable, are at the disposal of mankind. They will carry you through the atmosphere wherever and whenever you choose. That is, if you know how to control them. Now, here is a machine I have myself perfected."
The Demon drew from his pocket something that resembled an open-faced watch, having a narrow, flexible band attached to it.
"When you wish to travel," said he, "attach this little machine to your left wrist by means of the band. It is very light and will not be in your way. On this dial are points marked 'up' and 'down' as well as a perfect compass. When you desire to rise into the air set the indicator to the word 'up,' using a finger of your right hand to turn it. When you have risen as high as you wish, set the indicator to the point of the compass you want to follow and you will be carried by the proper electric force in that direction. To descend, set the indicator to the word 'down.' Do you understand?"
"Perfectly!" cried Rob, taking the machine from the Demon with unfeigned delight. "This is really wonderful, and I'm awfully obliged to you!"
