... potential market for books (manuals) that deal with the sequence and tech-niques of performing the various, unmixed specialisms of the trade. Such is the aim of this book, to present a practical ... to the second edition; Kevin Hodger, ex colleague (inventor of the Roofmaster Square); Kingsview Optical Ltd (suppliers of the Roofmaster Square) Harbour Road, Rye, East Sussex TN31 7TE, UK, ... the amount of written information on working drawings, abbreviations are often used. A selection are shown here: BMA ϭ bronze metal antique DPC ϭ damp-proof course DPM ϭ damp-proof membrane...