| Bartolomeu de Gusmão | |
| Birth Date: | December 1685 |
| Birth Place: | Santos, São Paulo, Colonial Brazil, Portugal |
| Death Place: | Toledo, Spain |
| Nationality: | Portuguese |
| Known For: | Airship design |
| Notable Works: | Hot air balloon, Passarola, Water elevation system |
| Signature: | Assinatura Bartolomeu Lourenço de Gusmão.gif |
Bartolomeu Lourenço de Gusmão (December 1685 – 18 November 1724) was a Portuguese priest and naturalist from Colonial Brazil who was a pioneer of lighter-than-air aerostat design, being among the first scholars at that time to understand the operational principles of the hot air balloon and to build a functional prototype of such device. He is also one of the main characters in Nobel Prize-winning José Saramago's Baltasar and Blimunda.
Gusmão was born at Santos, then part of the Portuguese colony of Brazil.
He began his novitiate in the Society of Jesus at Bahia when he was about fifteen years old, but left the order in 1701. He went to Portugal and found a patron at Lisbon in the person of the Marquis of Abrantes. He completed his course of study at the University of Coimbra, devoting his attention principally to philology and mathematics, but received the title of Doctor of Canon Law (related to Theology). He is said to have had a remarkable memory and a great command of languages.
In 1709, he presented a petition to King João V of Portugal, seeking royal favour for his invention of an airship, in which he expressed the greatest confidence. The contents of this petition have been preserved, together with a picture and description of his airship. Developing the ideas of Francesco Lana de Terzi, S.J., Gusmão wanted to spread a huge sail over a boat-like body like the cover of a transport wagon; the boat itself was to contain tubes through which, when there was no wind, air would be blown into the sail by means of bellows. The vessel was to be propelled by the agency of magnets which were to be encased in two hollow metal balls. The public test of the machine, which was set for 24 June 1709, did not take place.
It is known that Gusmão was working on this principle at the public exhibition he gave before the Court on 8 August 1709, in the hall of the Casa da Índia in Lisbon, when he propelled a small balloon to the roof using combustion from a flame. The king rewarded the inventor by appointing him to a professorship at Coimbra and made him a canon. He was also one of the fifty selected as members of the Academia Real de História, founded in 1720; and in 1722 he was made chaplain to the Court. Gusmão also busied himself with other inventions, but in the meantime continued his work on his airship schemes, the idea for which he is said to have conceived while a novice at Bahia. His designs included a ship to sail in the air consisting of a triangular gas-filled pyramid, but he died without making progress.
One account of Gusmão's work suggests that the Portuguese Inquisition forbade him to continue his aeronautic investigations and persecuted him because of them, but this is probably a later invention. It dates, however, from at least the end of the 18th century, as the following article in the London Daily Universal Register (later The Times) of 20 October 1786, makes clear:
Contemporary documents do attest that information was laid before the Inquisition against Gusmão, but on quite another charge. The inventor fled to Spain and fell ill of a fever, of which he died in Toledo. He wrote: Manifesto summário para os que ignoram poderse navegar pelo elemento do ar (Short Manifesto for those who are unaware that is possible to sail through the element air, 1709); and Vários modos de esgotar sem gente as naus que fazem água (Several ways of draining, without people, ships that leak water, 1710); some of his sermons also have been printed.
In 1936, the Bartolomeu de Gusmão Airport was built in Rio de Janeiro, Brazil, by the Luftschiffbau Zeppelin to operate with the rigid airships Graf Zeppelin and Hindenburg. In 1941, it was taken over by the Brazilian Air Force and renamed Santa Cruz Air Force Base. Presently, the airport serving Araraquara is named Bartolomeu de Gusmão Airport.