In 1879, Carlos Ibáñez e Ibáñez de Ibero for Spain and François Perrier for France executed the junction of the Spanish geodetic network with Algeria and thus completed the measurement of the Paris meridian which extended from Shetland to the Sahara.
In 1879, Carlos Ibáñez e Ibáñez de Ibero for Spain and François Perrier for France executed the junction of the Spanish geodetic network with Algeria. The triangulation of France was then connected to those of Great Britain, Spain and Algeria and thus the Paris meridian extended from Shetland to the Sahara.