view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A semi-automatic graphical intensitometer for the reduction of microphotometer tracings. Beals, C. S. Abstract Following a review of present day methods of reducing the drudgery of photographic spectrophotometry, reasons are given for selecting a mechanical instrument of semi-automatic type for the reduction of tracings, along the lines of those built by Perepelkin,' Hemmendinger,2 and Pannekoek and Koelbloed.3 * Of papers presented at the Seventy-first Meeting of the American Astronomical Society, Cincinnati, Ohio, Novemher 5, 6,1943. A new design for such an instrument is described which will take tracings of any length up to 30 feet and which has magnifications between tracing and intensity record in the dispersion co-ordinate, of I : I, I : 2, and I : 4. The intensity record is drawn by a pen on a strip of paper 12 inches wide of any selected length. The scale of intensities can be varied at will up to a maximum of 10 inches. The instrument is shown to combine accuracy with speed and to reduce the time required for deriving line profiles from microphotometer tracings from one-fifth to one- tenth that required by older methods. It is hoped shortly to incorporate in the instrument a device for rectifying line profiles by automatically reducing the intensity of the continuous spectrum to unity throughout its length. The principles of the method, which requires two operators, and its obvious advantages in the case of stars with large numbers of lines are discussed in some detail. I.C. R. (Dokiady) Acad. Sci. U.S.S.R. `5, 25, 2937. 2.Rev. Sci. Instritments 9, 178, 1938. 3.B. A. N. 9, 155, i58, 1940. Don~inion Astrophysical Observatory, Victoria, B. C. Publication: The Astronomical Journal Pub Date: June 1944 DOI: 10.1086/105783 Bibcode: 1944AJ.....51...17B full text sources ADS |