|Statement||by E. D. McAlister.|
|Series||Smithsonian miscellaneous collections,, v. 87, no. 17|
|Contributions||Smithsonian Institution. Roebling Fund.|
|LC Classifications||Q11 .S7 vol. 87, no. 17|
|The Physical Object|
|Pagination||1 p. l., 18 p.|
|Number of Pages||18|
|LC Control Number||33026026|
Software Sites Tucows Software Library Shareware CD-ROMs Software Capsules Compilation CD-ROM Images ZX Spectrum DOOM Level CD. Featured image All images latest This Just In Flickr Commons Occupy Wall Street Flickr Cover Art USGS Maps. Full text of "Smithsonian miscellaneous collections". whichtransmitsalltheultra-violetandabsorbsallthevisible and infra-redrays,or (2) whichabsorbs all the ultra-violet and transmits all the visible and the infra-red. ANEWSPECTROPYRHELIOMETERANDMEASURE- MENTSOFTHECOMPONENTRADIATIONSFROM THESUNANDFROMAQUARTZ-MERCURYVAPOR LAMP CONTENTS Page . Discovery "Ultraviolet" means "beyond violet" (from Latin ultra, "beyond"), violet being the color of the highest frequencies of visible iolet has a higher frequency (and thus a shorter wavelength) than violet light. UV radiation was discovered in when the German physicist Johann Wilhelm Ritter observed that invisible rays just beyond the violet end of the visible spectrum.
For, specific investigations in which sources rich in ultra-violet are re-quired the mercury arc in quartz maybe used, (COBLENTZ and KAHLER (22) and COBLENTZ, DORCAS andHUGHES (21)). The iron arc is also rich in ultra-violet and presents a more uniform spectrum. Wherea continu-ous spectrum rich in ultra-violet is required for spectrophotometry theCited by: 3. Hyper-fine Structure of Spectrum Lines of Silver Arc in the Visible and the Ultra-violet Regions. Professor of Physics, L~icknoiu University. Research FelEo tc, L~lcknou: hlnioersify. (Rcceivad for publication, 8th Itioy, ) In earlier papers, the hyperfine-structure of arc lines of oadmium,' thallium: and dncs have been inv~tipated by the [email protected] Use a detrrium/h2 arc lamp in which a controlled electrical discharge causes h2/d2 to dissociate and emit UV Radiation from nm and are filled with mercury or Xe gas to intensify signal Difference between UV and Cis light source. ¥ot specific investigations in which sources rich in ultra-violet are re-quired the mercury arc in quartz may be used, (Coblentz and Kahler (22) and Coblentz, Dorcas and Hughes (21)). The iron arc is also rich in ultra-violet and presents a more uniform spectrum. Where a .
A.- Energy Content of ultra-violet lines of the quartz Mercury Arc. By means of a vacuum thermocouple it is possible to use a Leeds and Northrup high sensitivity galvanometer for these measurements directly. The sensitivity of the couple is increased from 6 to 15 fold by operation in a vacuum. Stabilization of the operation of the arc enables one to get accurate and reproducible results for Author: Charles Boromeo Kazda. Sources of Visible Light. range in power from 50 to watts and usually consist of two electrodes sealed under high mercury vapor pressure in a quartz glass envelope. Mercury and xenon arc lamps do not provide even illumination intensity across the entire wavelength spectrum from near ultraviolet to infrared. In contrast, xenon arc. Software Sites Tucows Software Library Shareware CD-ROMs Software Capsules Compilation CD-ROM Images ZX Spectrum DOOM Level CD. Featured image All images latest This Just In Flickr Commons Occupy Wall Street Flickr Cover Art USGS Maps. Full text of "Invisible Radiations Of Organisms". The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.A typical human eye will respond to wavelengths from about to nanometers. In terms of frequency, this corresponds to a band in the vicinity of – THz.