s on display at the International Exposition in 1867 There were 50,226 exhibitors, of whom 15,055 were from
France and its colonies, 6176 from
Great Britain and
Ireland, 703 from the
United States and a small contingent from
Canada. The funds for the construction and maintenance of the exposition consisted of
grants of $1,165,020 from the French government, a like amount from the city of Paris, and about $2,000,000 from public subscription, making a total of $5,883,400; while the receipts were estimated to have been but $2,822,900, thus leaving a deficit, which, however, was offset by the subscriptions from the government and the city of Paris, so that the final report was made to show a gain.
Bateaux Mouches, boats capable of carrying 150 passengers, entered service conveying visitors along the Seine to and from the exhibition. There was also a new railway line built to convey passengers around the outer edge of Paris to the Champ de Mars. Two double-decker hot air balloons, the
Géant and the
Céleste, were moored to the site and manned by the famous photographer
Nadar. Nadar would take groups of 12 or more people for flights above the grounds, where they could enjoy views of the site and Paris.
Willème's
photosculptures were displayed in a dedicated pavilion. Napoléon III was particularly interested in exhibiting prototypes, designs, and models of workers' housing in the section of the exposition dedicated to workers' living conditions. He commissioned the architect Eugène Lacroix to design and build a set of four buildings on the rue de Monttessuy, at the edge of the exposition grounds, to demonstrate that affordable, decent housing for the working classes could be built at a profit. The exhibition also included two prototypes of the much acclaimed and prize-winning
hydrochronometer invented in 1867 by Gian Battista Embriaco, O.P. (Ceriana 1829 - Rome 1903), professor at the
College of St. Thomas in Rome. (1867),
Drexel University, USA One of the Egyptian exhibits was designed by
Auguste Mariette, and featured ancient Egyptian monuments. The
Suez Canal Company had an exhibit within the Egyptian exhibits, taking up two rooms at the event. Which it used to sell bonds for funding. The fair included a large ordnance section, showing improvements made in recent wars, in
rifling,
breechloading, and
armored ships. The huge naval guns that were exhibited drew a lot of attention. The British government sent in a RML 12-inch 25-ton gun| gun that weighed 23 tonnes. The German manufacturer
Krupp displayed a steel gun that weighed 50-tonnes. During the exhibition, the French government introduced a
gun that weighed 38-tonnes. Other nations that sent ordnance were: Austria, Belgium, Saxony, Holland, Egypt, and others. Contemporary accounts, such as François Ducuing's ''L'Exposition Universelle de 1867 Illustrée'' (1867), provide detailed descriptions of the artillery exhibits in the Machinery Gallery. The Prussian display featured a massive 50-tonne cast-steel breech-loading gun (35.5 cm calibre) manufactured by Friedrich Krupp of Essen. Forged under a 50-tonne steam hammer and reinforced with steel hoops, it required a specially built 23-tonne railway wagon for transport to Paris. Britain exhibited naval guns including a 9-inch (22.8 cm) Armstrong gun (12.5 tonnes) with an innovative recoil brake and loading cradle, as well as a Whitworth gun notable for its hexagonal rifling. Sweden presented metallurgy from the Finspång works, including composite projectiles (hardened steel surface with cast-iron core) and heavy guns displayed in the park. France showed its new breech-loading naval artillery reinforced with hot-fitted steel hoops. The largest piece was a 42 cm coast-defense gun weighing approximately 37–38 tonnes, capable of firing 300 kg projectiles to a range of about 7,800 metres. These displays illustrated the rapid progress in heavy steel artillery and breech-loading technology among European powers shortly before the Franco-Prussian War of 1870. Americans displayed their latest telegraph technology and both
Cyrus Field and
Samuel Morse provided speeches. French
explorer and early
ethnobotanist Marie-Théophile Griffon du Bellay exhibited a display of dried specimens of some 450 species of useful plant, collected in the course of his recent explorations of
Gabon and annotated with accounts of the uses to which they were put in their native land. Most notable among these were the powerful stimulant and hallucinogen
Tabernanthe iboga, containing the alkaloid
ibogaine, (currently being investigated as a cure for
heroin and other addictions), the legume
Griffonia simplicifolia (found, subsequently, to be rich in the
serotonin precursor
5-HTP), and
Strophanthus hispidus, an effective
arrow poison, due to its containing
cardiac glycosides with
digoxin-like effects. Griffon du Bellay was awarded two medals for his exhibit. The exposition was formally opened on 1 April and closed on 31 October 1867, and was visited by 9,238,967 persons, including exhibitors and employees. This exposition was the greatest up to its time of all international expositions, both with respect to its extent and to the scope of its plan. ==Influence==