The second phase of industrial revolution from 1850

• Source of energy was mainly electricity and petroleum
• Steel became the main source of industrial material.
• Successful dynamo made 1873, a machine convert mechanical energy into electrical energy
• Initially in 1837 Moor's telegraph was invented, later advanced and used to transmit messages.
• In 1876 Alexander Graham Bell invented the telephone.
• The invention of the radio by Guglielmo Marconi came in 1896.