Sash horns usually are not standard for Georgian period windows, both of those the top and base sashes must be squared off. Horns weren't essential because the lattice of glazing bars disperses the glass fat to become carried by the sash rails. The name "hung sash window", and that is https://solar-outdoor-lights45544.blogoxo.com/35716479/top-guidelines-of-sash-window-draught-proofing