The Waterfall That Compressed Air Without a Single Moving Part — The Trompe

At Ragged Chutes in northern Ontario, a waterfall once supplied compressed air to the Cobalt silver mines without pistons, turbines, or a fuel-burning compressor. A hydraulic air compressor called a trompe used falling water to trap bubbles, carry them deep underground, and squeeze them under pressure. The system turned the Montreal River into a regional utility. Water and air entered twin intakes, descended a 351-foot shaft, separated in an underground chamber more than 1,000 feet long, and sent cool compressed air through iron mains to power drills and hoists across Cobalt and Coleman. This documentary follows the trompe from early ironworks to Charles Havelock Taylor’s industrial designs and the vast Ragged Chutes installation. It examines the buried geometry behind its “no moving parts” reputation, the pipe network that made or broke its economics, its effects inside the mining district, and why electricity eventually offered a more flexible way to move waterpower across the landscape. It also traces what remains: old pipe routes, mining scars, and a river that still produces electricity. 00:00 Water power through an air pipe 03:09 Continuous air for the furnace 06:18 A bubble through the mountain 13:31 Trompes in the mining district 17:07 Compressor inside the excavation 22:32 Air from chamber roof to drill 27:29 Air changes before the worker 32:27 Compressed air service costs 36:57 River power generation 40:34 Smaller trompe applications 42:49 The pipe route Sources: Leroy E. Schulze, Hydraulic Air Compressors, U.S. Bureau of Mines Charles Havelock Taylor, U.S. Patent 892,772, Hydraulic Air-Compressor Dean L. Millar, A Review of the Case for Modern-Day Adoption of Hydraulic Air Compressors Cobalt Historical Society, Ragged Chute—Video Review Town of Cobalt, History of Cobalt Parks Canada, Cobalt Mining District National Historic Site of Canada TransAlta, Ragged Chute Hidden Works explores the forgotten machines, industrial systems, and supply networks that made the modern world function. Subscribe for more documentaries about forgotten machinery and industrial history. Tell us which mine machine or water-powered industry Hidden Works should explore next. #IndustrialHistory #ForgottenMachinery #Trompe #MiningHistory #CanadianHistory