Steam Canner: Processing
When should I start timing?
Begin timing when a steady stream of steam is escaping from the holes near the base of the dome at a constant rate. The steam will escape horizontally for a few inches, and then rise vertically until it dissipates into the atmosphere. Steam should be visible for at least 8 inches. If canning at high altitudes, there will not be an 8" plume of steam when it's ready. This is due to the difference in atmospheric pressure. As long as there is a steady stream of steam with no breaks, you can begin timing.