. Sometimes a double course ofslates, or one course of sawn Welsh slate bedded incement, is laid along the top of the walls when theyhave emerged above the ground-line. Some, again,interpose there a layer of sheet-lead, weighing fourpounds to the foot superficial. Another system is thepaying over… … Damp-proof Cotirses. loi layer is generally considered preferable. A course or twoof enamelled bricks, or ramped glazed bricks, are alsooccasionally laid, in order to arrest the rising damp.But the best article devised up to the present time is avitrified stone-ware tile, made in 99 thicknesses…
![An illustration from M. Vitrvvii viri svae professionis pertissimi De architectvra libri decem, ad Avgvstum Cæsarem accuratiss. conscripsit & nvnc primvm in Germania qva potuit diligentia excusi, atq[ue] hinc inde schematibus non iniucundis exornati (1543)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviivirisva00vitr-104-28.webp)
