FOREWORD.

The fourth [chapter] covers the manner of searching for, gathering, and conveying spring waters through stone-lined trenches, pipes, canals, and aqueducts; everything that may pertain to public fountains for distributing water into the various quarters of a city and to private houses; the form most suitable for distribution basins Small tanks or "cuvettes" used to split a main water supply into specific allotments for different users. so that the gauging and the apportionment of the water are handled judiciously; the best placement of reservoirs, conduit pipes, valves, inspection chambers original: "regards", and sumps original: "puisards", along with the use that can be made of them for extinguishing fires.

Finally, the fifth and last chapter of this volume contains everything appropriate for the decoration of pleasure gardens, to advantageously convey and distribute jetting waters Water directed through pressurized pipes to create ornamental fountain displays. so that they produce a pleasing effect; the method for determining the diameters of conduit pipes and those of the nozzles original: "ajutages"; the shaped tips of fountain pipes that determine the form of the water spray. in relation to the height of the jets and their discharge. Very convenient tables are provided on this subject, which eliminate the need for the calculations that would otherwise be required, followed by the construction of basins, reservoirs, and cisterns. This chapter concludes with several rules for determining the thickness that should be given to walls intended to support the pressure of water.

Those who know what has been written on Hydraulics and on machines suitable for lifting water will agree that there are few Books that feel less like a compilation than this one, and which are better suited to lead one insensibly to a perfect knowledge of Mechanics through the large number of different examples to which these principles are applied; but to truly grasp their connection, it is extremely important to immediately refer to the articles that will be found cited, which will contribute to making the entire Work familiar, which one can