<P> Many innovations took place at the Eiffel Tower in the early 20th century . In 1910 , Father Theodor Wulf measured radiant energy at the top and bottom of the tower . He found more at the top than expected , incidentally discovering what are known today as cosmic rays . Just two years later , on 4 February 1912 , Austrian tailor Franz Reichelt died after jumping from the first level of the tower ( a height of 57 metres ) to demonstrate his parachute design . In 1914 , at the outbreak of World War I , a radio transmitter located in the tower jammed German radio communications , seriously hindering their advance on Paris and contributing to the Allied victory at the First Battle of the Marne . From 1925 to 1934 , illuminated signs for Citroën adorned three of the tower 's sides , making it the tallest advertising space in the world at the time . In April 1935 , the tower was used to make experimental low - resolution television transmissions , using a shortwave transmitter of 200 watts power . On 17 November , an improved 180 - line transmitter was installed . </P>
<P> Many innovations took place at the Eiffel Tower in the early 20th century . In 1910 , Father Theodor Wulf measured radiant energy at the top and bottom of the tower . He found more at the top than expected , incidentally discovering what are known today as cosmic rays . Just two years later , on 4 February 1912 , Austrian tailor Franz Reichelt died after jumping from the first level of the tower ( a height of 57 metres ) to demonstrate his parachute design . In 1914 , at the outbreak of World War I , a radio transmitter located in the tower jammed German radio communications , seriously hindering their advance on Paris and contributing to the Allied victory at the First Battle of the Marne . From 1925 to 1934 , illuminated signs for Citroën adorned three of the tower 's sides , making it the tallest advertising space in the world at the time . In April 1935 , the tower was used to make experimental low - resolution television transmissions , using a shortwave transmitter of 200 watts power . On 17 November , an improved 180 - line transmitter was installed . </P>
how high up is the first floor of the eiffel tower
how high up is the first floor of the eiffel tower
57 metres
57 metres