"At this time ambassadors remained essential due to the slowness of communications. It could take a month for a letter to travel from London to St. Petersburg; in 1822 the record for an urgent dispatch to Vienna was one week. But in the 1840s and 1850s railways started to spread across the Continent, while steamships dramatically reduced the duration of sea voyages. After the introduction of the electric telegraph in the 1870s, ciphered telegrams replaced written dispatches for urgent business. Now that messages could be sent and answered within hours, the embassies in far-flung capitals could be subject to daily supervision. In 1904 the British diplomat Sir Francis Bertie complained that an ambassador had been reduced to the status of a “damned marionette,” with the Foreign Office pulling the wires."