The man that built the FNRS-1 balloon died in what year?
FNRS-1 The FNRS-1 was a balloon, built by Auguste Piccard, that set a world altitude record. It was named after the Belgian Fonds National de la Recherche Scientifique, which funded the balloon.
Percival G. Spencer Percival Green Spencer (11 November 1864, Islington, London, England – 11 April 1913, Highbury, London) was a British pioneering balloonist and parachutist.