In March 1889 he was assigned to the Paris Observatory at the Parc Montsouris under Vice-Admiral Mouchez .
Schwerer was promoted to Lieutenant ( Lieutenant de vaisseau ) on 23 June 1888 .
In March 1889 Schwerer was assigned to the Paris Observatory at the Parc Montsouris under Vice-Admiral Mouchez .
Schwerer was promoted to Lieutenant ( Lieutenant de vaisseau ) on 23 June 1888 .