Henri Owen Tudor (30 September 1859 – 31 May 1928) was a Luxembourgish engineer, inventor and industrialist. He developed the first commercially usable lead-acid battery.
Life Henri Tudor was the son of John Thomas Tudor from Llanarth (United Kingdom) and Marie Loser from Rosport. He attended the primary and secondary school as a boarder at the municipal College of Chimay (Belgium), and was a student from 1879 to 1883 at the École Polytechnique, which was part of Brussels University.Henri Werner, Ernest Reiter, Henri Owen Tudor. An Idea ... and Where it Led, Rosport 2012,(), pages 23–29 In 1885, the young engineer specialised at an electrical engineering institution in Paris,"Die elektrische Beleuchtung in Echternach", Luxemburger Zeitung, 4 January 1887 where he attended the lectures given by Marcel Deprez.L. Jumau, Henri Tudor. Ingénieur, Fondateur et Administrateur de l'ancienne Société de l'Accumulateur Tudor: Revue générale de l'Électricité, 28 juilltet 1928, page 132
Henri Tudor was interested in electricity and especially in its storage. He developed an electric lighting system in his father's residence, the Irminenhof in Rosport, even before he had completed his engineering studies. During his vacations, he connected a Gramme type generator to the water-wheel of the Bannmillen, a mill located on the lower part of the property. Wires carried the electric energy from the mill to the house, which was illuminated with Edison light bulbs. The power supplied by the generator was obviously irregular. Furthermore, it was not used during off-peak hours. Henri Tudor had the idea of using lead acid accumulators as a buffer – to equalise the voltage and to store the unused energy.
The chemical reactions occurring in a lead-acid battery or accumulator were first observed by in 1854. The accumulator as a rechargeable battery was invented in 1859 by Gaston Planté and improved in 1880 by Camille Faure. In its practical applications, it proved however to be unreliable: short circuits occurred and the plates fell apart during service. Thomas Edison described the lead-acid accumulator as a "a catch-penny, ... a mechanism for swindling the public" and "commercially ... a failure."Richard H. Schallenberg, Bottled Energy. Electrical Engineering and the Evolution of Chemical Energy Storage, Philadelphia, Memoirs of the American Philosophical Society, vol. 148, 1982 (), pages 67–68
Henri Tudor sought a permanent solution to these problems and manufactured himself a mould for casting large surface plates with which he built a lead-acid accumulator of his own design. Doing so, he could rely on the help of his brother Hubert, and of his cousin, of Trier. With the combined equipment – generator and buffer battery – he was able to run continuously and constantly the power supply of the Irminenhof, which thus became the first private home in Luxembourg to have electric lighting.Henri Werner, Ernest Reiter, Henri Owen Tudor. An Idea ... and Where it Led, Rosport 2012,(), pages 55–57
The Tudor electrode stood out because of its unequalled reliability. We know from a reliable source that a Tudor accumulator was put into service in October 1882 and that it ran without any interruption until December 1887. Accumulator plates having been in regular service during 16 years are exhibited in the Tudor Museum in Rosport.
On 5 May 1891, Henri Tudor married Marie-Madeleine Pescatore of Bofferdange. They had three children and the young family moved in September 1892 into their newly built monumental Manor House in Rosport.
In 1914, Henri Tudor began to suffer from a serious lead poisoning, which caused his death on 31 May 1928, aged 68.
Patents of Henri Tudor
1886 Patent On 17 July 1886, Henri Tudor filed, in Luxembourg, patent No 711 "Further improvements to the electrodes of electric accumulators". This patent was also filed in Belgium and France.
The improvements consist of the following: The plates (electrodes) are thick enough to be rigid and to provide a high level of conductivity; they are grooved so as to offer a large surface, the grooves being slightly tapered. The plates undergo a formation in accordance with the method developed by Planté but of much shorter duration, the grooves are then filled with a lead oxide paste according to the Faure process (smearing). The plates are then treated with a weak intensity current until the paste is transformed into lead peroxide on the positive plates and into reduced lead on the negative plates. The Planté layer provides a good adhesion of the active paste and the tapered shape of the grooves allows the paste particles to slip during the successive charging and discharging cycles of the battery without causing distortions of the plate. Disintegrated oxide particles fall into cavities deliberately left below the plates. The Planté layer is strengthened during the charging and discharging cycles: the final formation of the Tudor plate happens during the actual use of the accumulator. The Tudor electrode combines the advantages of the Planté and Faure methods while avoiding their respective disadvantages.
1896 Patent In order to avoid the smearing operation, which was laborious and hazardous, Henri Tudor was looking for ways to create a Planté layer by means of an accelerated electrochemical process. On 18 May 1896, he filed, in the United Kingdom, his Patent No 10718 on the electrode coated with a thin layer of oxide. This layer was obtained by reverse electrolysis in very dilute acid in order to promote the formation of "lead oxide containing sulphate", which actually consisted of basic lead sulphates described by the general formula x PbO • y PbSO4 • z H2O. This invention led to a weight reduction in the electrodes while increasing their capacity, and resulted in a reduction in the sale price of up to 15 per cent."Tudor Accumulators", The Electrical Review, Vol. 39, No 975, 31 July 1896, page 146
Electric lighting systems
On 30 April 1886, Henri Tudor signed a convention with the Town Council of Echternach concerning the replacement of the existing petroleum street by electric lighting. It was understood that the electric power plant would include a steam boiler, two dynamos and Tudor lead-acid accumulators. For the execution of this project, he founded with his brother Hubert and his cousin Nikolaus Schalkenbach, the firm Tudor Frères & Schalkenbach and established workshops in Rosport. The electric lighting system went on stream on 24 October 1886. Echternach was proud to be the first town in the country to benefit from electric lighting.Henri Werner, Ernest Reiter, Henri Owen Tudor. An Idea ... and Where it Led, Rosport 2012,(), pages 74–95
In 1887, Henri Tudor concluded a contract for electric lighting in the small town of Dolhain-Limbourg (Belgium). In 1889, he founded the Société Anonyme Belge pour l'Éclairage public par l'Électricité in Brussels so as to provide a more solid basis for his business activities in Belgium. He then installed two power stations, one in Brussels and one in Ghent.
In May 1889, 150 public or private stationary Tudor batteries were in operation in Belgium and in the rest of Europe. In July 1891, their number was 1200, which corresponded to more than 3 million electrodes.Notice, Bruxelles, Société anonyme Franco-Belge pour la fabrication de l'accumulateur "Tudor", July 1891, page I
Rosport, Tudor's home village, had to wait until 1901 to benefit from electric lighting. The development of direct current networks based on accumulators was inevitably limited and that, in the long term, it even hampered the supply of electricity in its more efficient form: the alternating current.
Industrial activities The Rosport factory The manufacture of Tudor accumulators started in 1885 in the Rosport workshops, installed on the property known as Engelsbuerg. As from January 1897, following the dissolution of the Société Anonyme Franco-Belge pour la fabrication de l’accumulateur Tudor, the Rosport factory manufactured and marketed accumulators not only for Luxembourg but also for Belgium. The workforce exceeded at least occasionally 30 people. From 1899 to 1901, the yearly output exceeded 200 tons. The Rosport factory was unable to cope with the rapid increase in demand and Luxembourg's customs status within the German Customs Union (Zollverein) hampered its development. In 1901, most of the production was transferred to Florival near Wavre. The Rosport factory was shut down in 1908.
The emergence of an industrial giant in Germany In 1885, Adolph Müller, commercial representative for the Spiecker & Co. Electric Company in Cologne, travelled to Rosport to get further information on the reliable accumulator running in Rosport already for several years. After spending a few hours with Henri Tudor, Müller was convinced that he had seen with his own eyes an innovation which could be developed on a large scale.Adoloph Müller, 25 Jahre der Accumulatoren-Fabrik Aktiengesellschaft 1888–1913, Berlin, AFA, 1913, pages 1–3 The two men agreed to wait until the large-scale street-lighting system in Echternach had been put in place. Once that had passed the test, Müller would begin to market, in Germany, accumulators made in Rosport. On 15 July 1888, Müller concluded an agreement with the Tudor brothers which assigned to the Accumulatoren-Fabrik Tudor'schen Systems Büsche & Müller in Hagen the exclusive right to manufacture and market Tudor accumulators in Germany, central and eastern Europe, and Scandinavia. The agreement also provided for the sharing of technology and licenses. Henri Tudor moved to Hagen to provide technical assistance during the start-up of the factory. He returned to Rosport in late 1888. Two years later, the Accumulatoren-Fabrik Tudor'schen Systems Büsche & Müller, now renamed Büsche & Einbeck, concluded an agreement with Siemens & Halske and AEG to establish a joint-stock company, the Accumulatoren-Fabrik Aktiengesellschaft (AFA).Oskar Clemens, 50 Jahre Accumulatoren-Fabrik Aktiengesellschaft 1888–1938, Berlin/Hagen/Wien, AFA, 1938, page 49 The demand was booming and turnover reached 3 300 000 marks. In 1891, it established a central research laboratory, where Henri Tudor acted as a scientific adviser. The improvements that he made included the negative plate with scraped-off paste and the unitary plate (1891), the development of new foundry moulds for finer grooves (1895–1896) and a solution to the problem of capacity loss observed on negative electrodes (1895–1896).Adoloph Müller, 25 Jahre der Accumulatoren-Fabrik Aktiengesellschaft 1888–1913, Berlin, AFA, 1913, pages 54–84 AFA occupied a leading position on the German accumulator market and AFA shares were quoted on the Berlin Stock exchange from 1894 onwards.Adoloph Müller, 25 Jahre der Accumulatoren-Fabrik Aktiengesellschaft 1888–1913, Berlin, AFA, 1913, pages 40–46 AFA changed its name in 1962 to Varta Aktiengesellschaft.
Industrial activities in Western Europe Henri Tudor took measures to make sure that his accumulator was manufactured and marketed in geographical areas where Adolph Müller had not been assigned any rights.
He granted an operating licence to Piaux, Georgin, Bayeux & Co. in Reims. In 1888, that company began manufacturing Tudor accumulators at its factory in Jonchery-sur-Vesle. On 10 April 1889, he assigned the same rights to the Société Anonyme Belge pour l’Eclairage Public par l’Electricité, which developed a manufacturing site in Faches-Thumesnil, on the outskirts of Lille. It began operations in 1891, and production at Jonchery was discontinued.