Printed from: https://conservationhandbooks.com/dry-stone-walling/rebuilding-a-free-standing-wall/throughs/
‘Throughs’ or ‘throughstones’ straddle the wall, connecting one face with the other. They help keep the wall from bulging outward as it settles by tying the two faces together into a single unit. This maintains the wall’s equilibrium by distributing the weight of upper layers equally onto both faces below. The number and spacing of...