Displacement Interferometry By The Aid Of The Achromatic Fringes, Part 3 (1919) is a scientific book written by Carl Barus. It is a continuation of his previous works on displacement interferometry and focuses on the use of achromatic fringes in the process. The book is divided into several chapters, each discussing a specific aspect of the topic. The first chapter provides an introduction to the concept of displacement interferometry and the use of achromatic fringes. The subsequent chapters delve deeper into the technical aspects of the process, including the design and construction of the necessary equipment, the measurement of small displacements, and the calculation of interference fringes. The book also includes numerous illustrations and diagrams to aid in understanding the concepts presented. Overall, Displacement Interferometry By The Aid Of The Achromatic Fringes, Part 3 (1919) is a comprehensive guide to the use of displacement interferometry and achromatic fringes in scientific research.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.