[1]Archived 2009-05-30 at the Wayback Machine Societe Astronomique, pp. 234–248, 1912 – By Camille Flammarion (Translation from French by LRM) p. 240 "A balloon dirigible, having on board Admiral Fournier and Colonel Bourgeois permitted good perception of the moon's shadow at a speed of 800 m/sec ... From a captive balloon near Saint-Nom-de-la-Breteche, Captain Dupic made analogous observations which confirmed those made from the dirigible."
[1]Archived 2009-05-30 at the Wayback Machine Societe Astronomique, pp. 234–248, 1912 – By Camille Flammarion (Translation from French by LRM) p. 240 "A balloon dirigible, having on board Admiral Fournier and Colonel Bourgeois permitted good perception of the moon's shadow at a speed of 800 m/sec ... From a captive balloon near Saint-Nom-de-la-Breteche, Captain Dupic made analogous observations which confirmed those made from the dirigible."