Hydraulic Model: shots of group of engineers and visitors listening to Dr Holden, chief engineer of the Saint Lawrence power project, of Dr Holden at blackboard speaking, wielding pointer. Shots of the International Joint Commission members listening, looking at model of seaway at Long Sault Rapids, at Galop Rapids. Two shots of General AGL McNaughton (with glasses) speaking to Harry Lea. Two shots of Brigadier General Paul D Berrigan, US Army engineer and Major General Charles George Holle, department chief of engineers for US Army construction. CU of Honorable Lionel Chevrier. Shot of model, commission members looking at it.