These are the bags that begin the springline that creates the arc of an arch. Fan bags are first tamped from the inside, similar to a hard-assed bag. The main difference is that a fan bag is tamped into a wedge shape and is filled only 12 inches (30 cm) high. This height fan bag
produces a strong, attractive framework around the arch openings and ties in well with the barbed wire mortar and surrounding bag work.
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