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Photograph negative is a copy of two photograph prints, showing: man with donkey in front of openings for hydraulic tunnels to be connected to the surge tank with penstocks for Buntzen Lake Power Plant number two; and water flowing over the spillway at the Coquitlam Dam. Negative was created in order to produce lantern slides of the two images.

Photograph negative is a copy of a page from a Sept. 21, 1912 article in the "Engineering Record", containing a plan of dam and tunnels. Negative was created in order to produce a lantern slide of the image.

Photograph negative is a copy of a page from a Sept. 12, 1912 article in the "Engineering Record", entitled "Enlargement of the Coquitlam-Buntzen hydro-electric power development". Negative was created in order to produce a lantern slide of the image.