A set of the 10 Manhès-David acid converters (Allis-Chalmers type) operated by the Canadian Copper Company before 1911. The shell was 84 x 126 inches. If the starting matte was 36% Ni+Cu, the acid lining lasted 8 hours, or 7 tons of 80% Ni+Cu converted matte ; each blow lasting 1h 5min. If the starting matte was 30% Ni+Cu, the acid lining lasted 5.3 tons of converted matte ; each blow lasting 1h 15min.