Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Paint is specified by three classes Of engineers: first, by a few who understand the importance of the mat ter, and have definite and to some ex tent original ideas as to the kind Of paint and the method Of its applica tion, and who will take some trouble to secure good results; second, by a much larger number who do some.