^In the case of Francis B. Ogden, Symonds was correct. Ericsson had made the mistake of placing the rudder forward of the propellers, which made the rudder ineffective. Symonds believed that Ericsson tried to disguise the problem by towing a barge during the test.
^The emphasis here is on ship. There were a number of successful propeller-driven vessels prior to Archimedes, including Smith's own Francis Smith and Ericsson's Francis B. Ogden and Robert F. Stockton. However, these vessels were boats – designed for service on inland waterways – as opposed to ships, built for seagoing service.
^"The type of screw propeller that now propels the vast majority of boats and ships was patented in 1836, first by the British engineer Francis Pettit Smith, then by the Swedish engineer John Ericsson. Smith used the design in the first successful screw-driven steamship, Archimedes, which was launched in 1839.". Marshall Cavendish, p. 1335.
^"The propeller was invented in 1836 by Francis Pettit Smith in Britain and John Ericsson in the United States. It first powered a seagoing ship, appropriately called Archimedes, in 1839." Macauley and Ardley, p. 378.
^"In 1839, the Messrs. Rennie constructed the engines, machinery and propeller, for the celebrated Archimedes, from which may be said to date the introduction of the screw system of propulsion ...". Mechanics Magazine, p. 220.
^"It was not until 1839 that the principle of propelling steamships by a screw blade was fairly brought before the world, and for this we are indebted, as almost every adult will remember, to Mr. F. P. Smith of London. He was the man who first made the screw propeller practically useful. Aided by spirited capitalists, he built a large steamer named the "Archimedes", and the results obtained from her at once arrested public attention.". MacFarlane, p. 109.
^"Industry Pays Tribute to Innovation Awards Winners" Marine link, 3 October 2002. Accessed: 15 March 2014. Quote: "Winner: the energy-saving Kappel propeller concept from the European Commission-funded Kapriccio propulsion research project. Blades curved towards the tips on the suction side reduce energy losses, fuel consumption, noise and vibration"