<a href="https://en.wikipedia.org/wiki/Bartolomeu_de_Gusmão" id="mwZg" rel="mw:WikiLink" title="Bartolomeu de Gusmão">Bartolomeu de Gusmão</a> demonstrates the lifting power of hot air in an audience before the king of Portugal in <a href="https://en.wikipedia.org/wiki/Lisbon" id="mwZw" rel="mw:WikiLink" title="Lisbon">Lisbon</a>, Portugal.