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+91-9773740100 Yusuf Products https://www.indiamart.com/yusuf-products/ A Gas Mantle is a device that gives of considerable light when heated. The name refers to its original power source, existing gaslights, which filled the streets of Europe and North America in the late 19th Century mantle, About Us A Gas Mantle is a device that gives of considerable light when heated. The name refers to its original power source, existing gaslights, which filled the streets of Europe and North America in the late 19th Century mantle, referring to the way it hung above the flame. Gas Mantles are still being used in Uttar Pradesh and Bihar in India, Afghanistan, Pakistan and Bangladesh. The gas mantle was one of the many inventions of Auer von Welsbach, a chemist who studied rare earth element in 1880. His first process used a mixture of 60% Magnesium Oxide, 20% Lanthanum Oxide and 20% Yttrium Oxide, which he called Actinophor. To produce a mantle guncotton is impregnated with the mixture and then heated, the cotton burns away leaving a solid, but fragile mesh of ash. These original mantles gave off a green tinted light and were not very successful, and his first company formed to sell them failed in 1889. A new mixture of 99% Thorium Oxide and 1% Cerium Oxide gave off much whiter light, and after introducing it commercially in 1892 it quickly spread through out Europe. The gas mantle remained an important part of street lighting until the wide spread of electric lighting in early 1900. A mantle is basically a small sock made of silk or asbestos. Asbestos can withstand high temperatures, but is also toxic. Silk-based mantles are extremely brittle once first burnt and must be replaced frequently. Thorium is radioactive, and Pure Thorium becomes more radioactive as it ages owing to its... For more information, please visit https://www.indiamart.com/yusuf-products/aboutus.html F a c t s h e e t Year of Establishment : 1889 Nature of Business : Manufacturer CONTACT US Yusuf Products Contact Person: Ilyas Makani No. 17 D, Memonwada Road Mumbai - 400003, Maharashtra, India +91-9773740100 https://www.indiamart.com/yusuf-products/.

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Selective Radiation from Various Substances, Iii
. SELECTIVE RADIATION FROM VARIOUS SUBSTANCES, III By W. W. Coblentz CONTENTS Page. I. Introduction 243 II. Apparatus and Methods 244 1 The Spectrometer 244 2. Comparison of Dispersion of Prisms 246 3. The Radiometers 247 4. The Rotating Sectored Disk 249 5. Accuracy Attainable 252 III. The Acetylene Flame.' 253 1 Historical 253 2. The Visible Spectrum 257 3. The Emissivity a Function of the Thickness of the Radiating Layer. 261 4. Comparison of Acetylene Flame and a Solid Radiator 264 5. Absorptivity of an Acetylene Flame 266 6. Summary 273 IV. The Selective Emission oif the Welsbach Mantle 274 1 Historical 274 2. The Visible Spectrum 277 3. Comparison of a Gas Mantle with a Solid Glower 278 V. Miscellaneous Substances 287 1 Emission of Arc of Nemst Glower Materials 287 2. Color Match Versus Spectral Intensity Match 288 I. INTRODUCTION The present investigation is the beginning of an attempt to supply a long-felt need of an accurate knov/ledge of the spectral energy distribution, of some standard sources of Hght, in the visible and in the ultra-violet parts of the spectrum. The problem is a difficult one and heretofore has never been given thorough attention. Once the spectral energy distribution of a standard source of illumination is accurately known, it is possible to obtain the spectral energy distribution of other weaker sources of radia- tion by indirect methods, such as by spectrophotography or spectrophotometry. The standard sources which are the most easily reproduced are probably well seasoned incandescent lamps 243 244 Bulletin of the Bureau of Standards [Voi.
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