An emergency slide to help workers evacuate the blending house in an emergency.
Looking into one of the fire slides, designed to evacuate patients extremely quickly. In 1880, a fire completely destroyed the asylum at St. Peter, Minnesota, killing 30 patients.
In case of fire, workers on higher floors would take the emergency slides to escape.
Blending the explosive ingredients was dangerous. It is no wonder that the blending house had so many emergency slides.