Do you recall the first time you visited a museum of natural history- and entered a large room containing the prehistoric remains of dinosaurs? The mind's eye might have created a scene in some primordial swamp, with one of these huge creatures moving about, trampling the lush vegetation beneath its awesome mass. This is the image that burned in the mind of John Kanerva, of Calgary, Alberta, in the 1920's after seeing a movie called "The Lost World." He determined to put his talents to work creating fullsize replicas of these denizens from the dim past. Kanerva, already employed by the Calgary Zoo to carve animals and paint murals for zoo displays, spent five years doing research on dinosaurs and developing construction methods that could produce the desired authenticity as well as strength sufficient to support the great mass of each creature. Models were built and in 1934 work began on the first of 56 dinosaurs for the park. "Dinny," as the residents of Calgary affectionately call the brontosaurus, took six men more than five weeks to frame. Construction was done by much the same methods as those used today with ferrocement. The 120 ton Dinny, 103 feet long and 32 feet tall, was built for a cost of $3,500. Today the cost of such a project might be in excess of $50,000- prohibitive when you consider that 56 of these creatures were finally completed.