ardour. Mr Hatch could not send me anything useful through the pipe until next night, although he did send me change for ten dollars as a test, so I proceeded with other parts of my plan. Then I evolved the method of escape, which I finally employed.
  'In order to carry this out successfully it was necessary for the guard in the yard to get accustomed to seeing me at the cell window. I arranged this by dropping linen notes to him, boastful in tone, to make the warden believe, if possible, one of his assistants was communicating with the outside for me. I would stand at my window for hours gazing out, so the guard could see, and occasionally I spoke to him. In that way I learned that the prison had no electricians of its own, but was dependent upon the lighting company if anything should go wrong.
  'That cleared the way to freedom perfectly. Early in the evening of the last day of my imprisonment, when it was dark, I planned to cut the feed wire which was only a few feet from my window, reaching it with an acid-tipped wire I had. That would make that side of the prison perfectly dark while the electricians were searching for the break. That would also bring Mr Hatch into the prison yard.
  'There was only one more thing to do before I actually began the work of setting myself free. This was to arrange final details with Mr Hatch through our speaking tube. I did this within half an hour after the warden left my cell on the fourth night of my imprisonment. Mr Hatch again had serious difficulty in understanding me, and I repeated the word "acid" to him several times, and later the words: "Number eight hat" â that's my size â and these were the things which made a prisoner upstairs confess to murder, so one of the jailers told me next day. This prisoner heard our voices, confused of course, through the pipe, which also went to his cell. The cell directly over me was not occupied, hence no one else heard.
  'Of course the actual work of cutting the steel bars out of the window and door was comparatively easy with nitric acid, which I got through the pipe in thin bottles, but it took time. Hour after hour on the fifth and sixth and seven days the guard below was looking at me as I worked on the bars of the window with the acid on a piece of wire. I used the tooth powder to prevent the acid spreading. I looked away abstractedly as I worked and each minute the acid cut deeper into the metal. I noticed that the jailers always tried the door by shaking the upper part, never the lower bars, therefore I cut the lower bars, leaving them hanging in place by thin strips of metal. But that was a bit of dare-deviltry. I could not have gone that way so easily.'
  The Thinking Machine sat silent for several minutes.
  'I think that makes everything clear,' he went on. 'Whatever points I have not explained were merely to confuse the warden and jailers. These things in my bed I brought in to please Mr Hatch, who wanted to improve the story. Of course, the wig was necessary in my plan. The special delivery letter I wrote and directed in my cell with Mr Hatch's fountain pen, then sent it out to him and he mailed it. That's all, I think.'
  'But your actually leaving the prison grounds and then coming in through the outer gate to my office?' asked the warden.
  'Perfectly simple,' said the scientist. 'I cut the electric light wire with acid, as I said, when the current was off. Therefore when the current was turned on, the arc light didn't light. I knew it would take some time to find out what was the matter and make repairs. When the guard went to report to you the yard was dark, I crept out the window â it was a tight fit, too â replaced the bars by standing on a narrow ledge and remained in a shadow until the force of electricians arrived. Mr Hatch was one of them.
  'When I saw him I spoke and he handed me a cap, a jumper and overalls, which I put on within ten
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