Originally published in New York in 1906. PREFACE: THE object of this book is to present in a simple manner those well-established principles of concreting which practice has shown applicable to the manufacture of concrete blocks for building hollow walls. The theoretical and technical questions which arise in connec- tion with the industry are only considered in so far as benefit may result to the operator in the actual manufacture of blocks and their use in construction. The conclusions which have been reached are the result not only of the authors experience in actual work, but of a...