photometric standard वाक्य
"photometric standard" हिंदी में photometric standard in a sentenceउदाहरण वाक्य
- Besides making valuable original contributions to the literature of his profession, Mr . Howell assisted, by his discussion of the papers of others, in developing many important themes relative to method of electrical distribution, photometric standards and allied subjects, and he was co-author, with Henry Schroeder, of the History of the Incandescent Lamp ( 1927 ).