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Military
engineer Harry Gordon warned that a direct hit by enemy mortar
fire on the vulnerable magazine in the south bastion could destroy
the entire fort. In 1759 this underground magazine was built to
secure the fort's powder supply. The heavy construction employed,
along with the steepness of the stairs and angle of the passageway,
protected the powder from enemy fire and would help contain an
accidental explosion. This fully restored building, based completely
on archeological evidence, had between six- and twelve-inch wall
timbers to hold back the surrounding earth and support the heavy
roof. The wall timbers were tenoned at their ends and set into
slots in the corner posts. The roof was made of two layers of
eight-inch-thick squared logs. with a heavy layer of yellow clay
piled on top of the timbers. For safety, powder kegs were bound
with copper or wooden hoops, and only non- ferrous tools were
used.
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