Photometric Researches: Made In The Years, 1872-1875 is a scientific book written by Charles Sanders Peirce and published in 1878. The book is a compilation of Peirce's research on photometry, a branch of physics that deals with the measurement of light. The research was conducted over a period of three years, from 1872 to 1875, and the book presents the results of these investigations. The book is divided into several chapters, each of which focuses on a specific aspect of photometry. Peirce discusses the measurement of light intensity, the properties of light sources, and the effects of various factors on the measurement of light. He also explores the relationship between light intensity and color, and the ways in which color can be measured and quantified. Throughout the book, Peirce presents detailed experimental data and mathematical calculations to support his findings. He also provides a thorough analysis of the existing literature on photometry, drawing on the work of other scientists and researchers in the field. Overall, Photometric Researches: Made In The Years, 1872-1875 is an important contribution to the field of photometry, and remains a valuable resource for scientists and researchers today.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.