HYDRAULIC MANUAL - 1883 - PREFACE THE FOURTH EDITION - IN this edition, some altbrations and extensive additions have been made. Chapter I. remains generally as before, the alterations being corn aratvel small in g L-the portion devoted to Sections of l o w 3 h e lotation from Nevilles work has been expunged, and that subject has been newly treated in the portion devoted to Distribution of Velocity in Section, full advantage has been taken of the deductions made by Major Allan Cunningham, and these have been inserted with his consent, but also with some modification for which he is not responsible the . references to Boxs work and to Stoddard and Dwyers works have been entirely expunged and the whole chapter has been revised. In Chapter II., a summary of the methods of gauging and of the operations of Major Allan Cunning ham in his recent experiments on the Ganges Canal, has been added. This has been reprinted from Engineering with the consent of the editor, and with that of Major Cunningham. This chapter has also undergone revision In Chapter III., the section on Irrigation in Italy, being partly statistical, has been removed, and the sections on Irrigation from Wells in India and on Indian Hydraulic Contrivances have been omitted. Other sections on Field Drainage, on the Ruin of Canals, and on Water-Meters have been added. Most of the sections in this chapter are modified reprints of articles originally written for Engineering, that have been reproduced with the consent of the editor of that paper...