When Rob became interested in electricity his clear-headed father considered the boy's fancy to be instructive as well as amusing; so he heartily encouraged his son, and Rob never lacked batteries, motors or supplies of any sort that his experiments might require.He fitted up the little back room in the attic as his workshop, and from thence a net-work of wires soon ran throughout the house. Not only had every outside door its electric bell, but every window was fitted[2] with a burglar alarm; moreover no one could cross the threshold of any interior room without registering the fact in Rob's workshop. The gas was lighted by an electric fob