Henry Louis was born on December 7, 1855, in Hackney, London, England.

He was a mining and metallurgical engineer and author. He studied at the Royal School of Mines and became active in international mining circles. He was engaged in iron and steelwork in Nova Scotia, in gold mining in Trinidad, South America, and West Africa, in gold and diamond mining in the Transvaal and South Africa, and in the mining of various ores in the Malay Peninsula, Siam, and other parts of the Far East. He was Professor of Mining at the University of Durham from 1896 to 1923, a member of many scientific bodies, and author of numerous textbooks and articles on mining and metallurgy. He served as president of the Iron and Steel Institute, the Institution of Mining Engineers, and the Society of Chemical Industry.

In 1895, he married Loli James (1860–). He died on February 22, 1939, in Newcastle upon Tyne, Northumberland, England.

Louis Franquet was baptized on June 11, 1697, in Condé-sur-l’Escaut, dept. of Nord, France.

Franquet was a French army officer and military engineer. He was commissioned into the army at the age of 12 and served in the infantry regiments of Franclieu, Miroménil, and Piémont from 1709 to 1720. In 1720, he joined the engineer corps, where he distinguished himself in Europe for the next 30 years. After participating in the Italian campaigns during the War of the Polish Succession from 1733 to 1736, he was appointed chief engineer at Condé in 1738. In 1741, he was awarded the cross of Saint-Louis. He was promoted to lieutenant colonel in 1747 but was wounded that same year at the siege of Bergen op Zoom.

In 1750, while serving as chief engineer at Saint-Omer, Franquet was asked to travel to Île Royale (Cape Breton Island) to assess the colony's defenses. His mission was to strengthen the fortifications at Louisbourg, including coastal defenses and batteries, in preparation for a potential British attack in the mid-18th century. Although his work focused on coastal defenses, his expertise in military engineering and fortifications was also crucial for defending French territories along the Ottawa River—a vital transportation route and boundary between Ontario and Quebec.

Upon arriving at Louisbourg in August 1750, Franquet examined buildings and fortifications, prepared maps and plans, and conducted experiments to identify the causes of structural deterioration. In 1751, he toured the rest of Île Royale, as well as Île Saint-Jean (Prince Edward Island), Baie-Verte, and Fort Beauséjour in New Brunswick. During this tour, he completed many plans and detailed reports on the fortifications at Louisbourg, making recommendations for necessary improvements. In the same year, he was promoted to colonel.

Between 1752 and 1753, Franquet travelled throughout Canada, examining fortifications and buildings in Quebec, Trois-Rivières, Montreal, and other towns and forts. He observed nearly every aspect of Canadian life. Franquet is remembered for his numerous maps and plans, his contributions to the construction of the original Louisbourg, and his reports from 1751, 1752, and 1753, which reflect his interest in the customs and lifestyles of the Indigenous peoples, Acadians, and Canadians.

He died on April 12, 1768, at Condé, France.

Spécialiste du droit canonique français, Georges Louet fut originaire d'Angers. Il franchit tous les échelons de la hiérarchie de l'église pour devenir un chanoine à la Cathédrale de sa ville natale. Sa réputation comme juriste le fit remarquer en tant qu'avocat dans la cause de divorce d'Henri IV et de Marguerite de France; mais sa renommée repose surtout sur son Recueil sur les Arrests, publié d'abord en 1602 et réédité 11 fois avant 1633.