ガス灯
Masson also invested in urban utilities of water supply and Gas lighting, in Montreal, in Quebec and in Toronto. At the invitation of his associates, he made an initial investment in Montreal, and his participation in 1842 reached more than a third of the "société du Gaz de Montréal". He founded with John Strang in 1841 the "Compagnie de l’eau et de l’éclairage au gaz" of Quebec, and with Furniss founded the "City of Toronto Light Gas and Water Company", of which he was president.