Cement and how to use it : a working manual of up-to-date practice in the manufacture and testing of cement : the proportioning, mixing, and depositing of concrete, and its application to all forms of concrete construction, plain and reinforced : with special chapters on concreting tools and machinery, waterproofing, working rules, etc. (1910)
Radford, William A., 1865- · Chicago : Radford Architectural Co. · leaf 217
198 CEMENT AND EIOW TO USE IT … Fig. 27. Window-Framing in First-Class Block Construction. laid in two courses, with an intervening air-space for insulation against cold and dampness, the two courses being bonded together either with metal ties or by the use of bonding headers or by means of concrete lugs on the blocks. With the…
Cement · Concrete construction
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.