Ces savants sont pour lui plus que des clients, des maîtres, dont il recherche les conseils tout en suivant leurs cours. After several years apprenticed to Paris engineer Paul-Gustav Froment, Ducretet opened his own workshop in 1864 at 21 Rue des Ursulines where with a few employees he manufactured classical physics research, teaching and demonstration apparatus. Over time his reputation grew and he became instrument supplier to several large Paris educational and scientific institutions.He was awarded a gold medal for his quality instruments at the 1878 Paris Universal Exposition and from then on his firm was a regular presence at important international expositions, winning another gold at the 1881 International Electricity Exposition in Paris. He was made a Knight of the Legion of Honour in 1885. Ducretet's work brought him into close contact with many prominent physicists of his day, from whom he learned a lot.
He continued his education, attending courses at the Sorbonne and College de France as a'auditeur libre'. He introduced a variation of Tesla coil as early as 1893. In 1897, hearing about Guglielmo Marconi´s pioneering experiments in wireless telegraphy (radio transmission), he built a transmitter and receiver and began his own experiments, becoming the first person in France to transmit radio waves.In November 1897 he transmitted radio signals 400 meters between his workshop and the Panthéon, attracting the interest of French President Félix Faure. On November 5, 1898 he caused a sensation with a public demonstration of wireless communication in the presence of representatives of the Académie des Sciences between the third floor of the Eiffel Tower and the Panthéon 4 km away. In 1897 he wrote to Russian physicist Alexander Stepanovich Popov, who had invented one of the first practical radio receivers but had not developed it, suggesting a collaboration. In 1898 he began to build radiotelegraph equipment using the Popov design. With his partner Ernest Roger he invented a type of telegraph key used in wireless telegraphy transmitters. In 1901 he wrote a book on the construction of wireless equipment. This is an extremely rare Nobili´s astatic galvanometer.
Made in Paris, France, during 1900s´. Made by the famous Ducretet & Roger (signed). Retailed in Buenos Aires by Otto Hess. Really impressive museum piece impossible.Needs to be calibrated but coil is working (i used a tester to check it). Tall excluding dome: 5.3/4 inches.
All defects not mentioned but visible in the pictures will be considered as described. If you have any question, please do not hesitate to contact me. Thank you for your visit. The item "ANTIQUE AMMETER 1900S NOBILI ASTATIC GALVANOMETER PARIS FRANCE BY DUCRETET RARE" is in sale since Thursday, January 31, 2019. This item is in the category "Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Other Antique Science Equip".
The seller is "rarityland" and is located in Buenos Aires, Buenos Aires. This item can be shipped worldwide.