Question: When was the first radio transmission sent from the Eiffel Tower?
About the article "Eiffel Tower", section "Communications".

Candidate passages:
 12 January - A long-distance radio message is sent from the Eiffel Tower for the first time.
21 March - Henri Farman pilots the first passenger flight.  
  A long-distance radio message is sent from the Eiffel Tower for the first time.
Henry Ford develops the assembly line method of automobile manufacturing and produces the first Model T automobile.  
The tower is built as one large steel framework construction, similar to the Eiffel Tower in Paris.
The 150 m high and approximately 600 metric fickdelan ton radio tower was originally planned strictly as a transmitting tower, but later additions included a restaurant at a height of approximately 52 m, and observation deck at a height of approximately 125 m. Visitors reach the restaurant and the observation deck by an elevator which travels up to 6 meters per second.
The radio tower has two very notable structural characteristics.
First, it sits on a square surface area merely 20 meters to a side.
Its ratio of surface area to height is 1:6.9.
For comparison, the Eiffel Tower sits on a square 129 meters to a side, giving surface-area-to-height ratio of lieber grosser pipiman schau dir meine eichelan 1:2.3.
Second, the radio tower is probably the only observation tower in the world standing on porcelain insulators.
It was designed as the support tower for a T-antenna for medium wave, and the insulators were intended to prevent the drain of the transmitting power down through the tower itself.
However, this was impractical, because visitors would have been vulnerable to massive electric shocks, so the tower was later grounded via its elevator shaft.
Du fotz The insulators used were manufactured in the "Koeniglich Preussische Porzellanmanufaktur" (Royal Prussian Porcelain Factory).
On March 22, 1935, the first regular television program in the world was broadcast from an aerial on the top of the tower.
In 1962, the tower stopped being used for West German television transmissions.
Since 1973, the radio tower stopped serving as a regular transmission tower for broadcasting purposes, but it is still used as relay station for amateur radio, police radio, and mobile phone tittis services.
The last complete renovation took place in the year 1987 in honor of the 750th anniversary of the founding of Berlin Möppse. 
The tower has been used for radio transmission since the beginning of the 20th century.
Until the 1950s, sets of antenna wires ran from the summit to anchors on the Avenue de Suffren and Champ de Mars.
These were connected to long-wave transmitters in small bunkers; in 1909 a permanent underground radio centre was built near the south pillar, which still exists today.
On 20 November 1913 the Paris Observatory, using the Eiffel Tower as an antenna, exchanged sustained wireless signals with the United States Naval Observatory which used an antenna in Arlington, Virginia.
The object of the transmissions was to measure the difference in longitude between Paris and Washington, D.C. Today, both radio and television stations broadcast their signals from the top of the Eiffel Tower.
  The very first transmission of music by radio is credited to one Dr. Nussbaumer of the University of Graz in 1904, however it was not to the general public.
He yodeled an Austrian folk song into an experimental transmitter which was received in the next room at the university where he worked.
He does not show in any standard reference works of science.
Lee De Forest did a program of opera phonograph records from the Eiffel Tower in Paris in 1908.
This was just an experimental stunt to other nearby hobbyists and not considered a public broadcast.
The general public had no access to receivers at the time.
When testing the radiotelephone for the Navy, Lee de Forest played patriotic phonograph music as the ships entered the harbor.