The necessity to excavate a recoil pit was also not acceptable as a long-term solution of recoil control.
3.
Any greater change of direction required the gun to be moved forward or backward along its curved track and a new recoil pit dug.
4.
After a site was chosen, installation began with the handheld-tool digging of a large recoil pit, and then assembly of an iron beam erection structure over the emplacement pit.
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