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This is a republication of Scientific Paper 373 (S373) from the Bureau of Standards, originally published in 1920 as part of Volume 16 of the Bureau’s scientific papers. The paper, entitled 'Characteristics of Striæ in Optical Glass,' delves into the study of striæ, which are imperfections or defects found within optical glass. Such imperfections can significantly impact the performance and quality of optical instruments and devices. The work provides detailed analysis and characterization of striæ, offering insights valuable to researchers, manufacturers, and anyone involved in the production or utilization of high-quality optical components. Though originally published nearly a century ago, the fundamental principles and methodologies discussed remain relevant for understanding and mitigating imperfections in optical glass today.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.