In 1870 Mark Twain was walking along the streets of Boston when he noticed in a shop window a machine he had never seen before. He entered the shop, asked the shop-assistant how the «monster» functioned and bought it for 125 dollars. He brought home the machine he had nicknamed «the monster» and started practising on it at once. The machine was a typewriter and Mark Twain typed a whole book on it. When he brought his «manuscript» to the editor, the latter was delighted. He made Mark Twain promise him to bring everything he would write later on typed on this wonderful machine. «Tom Sawyer» was the first book Mark Twain had typewritten.