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Molly Venter and her brother Josiah performing at Cafe Caffeine in Austin. They were backed up by Lance Harris on percussion. Photo by Ron Baker.
I have no idea if this hole was for a factory vent or if they drilled it. Why the fuck would you drill a hole in a reservoir?
With the fire stoked the evaporator will process 25-30 gallons of sap per hour. Evaporating the water is driven off as steam and leaves the sugar behind in the pans. A hood over the pans vents the steam through the roof...without this the inside of the sugar shed would become saturated with water.
When the fire is at its hottest there is very little smoke venting form the smoke stack.