There were a series of innovations in the printing technology in the 19th century. (i) Richard M. Hoe of New York perfected the power-driven cylindrical press. He could print 8000 sheets per hour. His press was very useful for printing newspapers. (ii) The late 19th century saw the development of offset press capable of printing six colours at a time. (iii) Electrically-operated press in the early 20th century increased the rate of printing operations. (iv) Methods of feeding paper improved, quality of plates became better, machines were fed automatic paper reels and photoelectric controls of colour register were introduced.