Today in 1949, George Orwell’s Nineteen Eighty-Four was published.  “The thought police would get him just the same. He had committed–would have committed, even if he had never set pen to paper–the essential crime that contained all others in itself. Thoughtcrime, they called it. Thoughtcrime was not a thing that could be concealed forever. You might dodge successfully for a while, even for years, but sooner or later they were bound to get you.”

In Nineteen Eighty-Four, the memory hole is a small chute leading to a large incinerator used for censorship:

In the walls of the cubicle there were three orifices. To the right of the speakwrite, a small pneumatic tube for written messages, to the left, a larger one for newspapers; and in the side wall, within easy reach of Winston’s arm, a large oblong slit protected by a wire grating. This last was for the disposal of waste paper. Similar slits existed in thousands or tens of thousands throughout the building, not only in every room but at short intervals in every corridor. For some reason they were nicknamed memory holes. When one knew that any document was due for destruction, or even when one saw a scrap of waste paper lying about, it was an automatic action to lift the flap of the nearest memory hole and drop it in, whereupon it would be whirled away on a current of warm air to the enormous furnaces which were hidden somewhere in the recesses of the building.

In the novel, the memory hole is a slot into which government officials deposit politically inconvenient documents and records to be destroyed. Nineteen Eighty-Four’s protagonist Winston Smith, who works in the Ministry of Truth, is routinely assigned the task of revising old newspaper articles in order to serve the propaganda interests of the government.

As soon as Winston had dealt with each of the messages, he clipped his speakwritten corrections to the appropriate copy of The Times and pushed them into the pneumatic tube. Then, with a movement which was as nearly as possible unconscious, he crumpled up the original message and any notes that he himself had made, and dropped them into the memory hole to be devoured by the flames.