Bunsen H E Roscoe (8 results)

Paperback. Condition: New. Print on Demand. This book explores the relationship between chemical and optical extinction in a wide range of substances. The author acknowledges that many bodies reflect a notable proportion of the light which falls on them. This book builds on earlier work to demonstrate that the amount of light absorbed by these substances is directly proportional to the intensity of the light falling upon them. The author has also investigated the phenomenon of the extinction of light as it passes through various media, and has found that the rate of extinction is also proportional to the intensity of the light. These findings have important implications for our understanding of the nature of light and the interaction of light with matter. In this book, the author meticulously describes the results of extensive experimentation, laying a solid foundation for further advancements in the areas of photochemistry and the interaction of light and matter. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item.

8°, flex. Originalleinen, 96 S., 13 Abb. im Text, Bibliotheksexemplar, Einband leicht berieben, sonst gut erhaltenes Exemplar. Ostwald s Klassiker der exakten Wissenschaften. Nr. 34. Deutsch 300g.

M. 31 Ill. 96, 107 S. Flex. OLwdbde. St. u. Name a. Tit. (Ostwald's Klassiker d. exakten Wiss. 34 u. 38). Sprache: Deutsch 0 gr.

8°. (2) X, 632 S. Mit 5 gefalteten Kupfertafeln. Pappband der Zeit. Erste Ausgabe. - Bunsen und Roscoe legten mit der obigen ersten (von sechs) Abhandlung den Grundstein für die messende Photochemie. Sie entwickelten einen Apparat, mit dessen Hilfe sie das Lambert'sche Absorptionsgesetz präzisieren konnten. Ihrer außerordentlichen Schwierigkeiten wegen bezeichnete Wilh. Ostwald die photochemischen Untersuchungen als Bunsen's Meisterarbeit. - Exlibris. Einband leicht bestoßen. - DSB 2, 586; Poggendorff I, 341; Darmstaedter 554.

8°. Je ca. 650 S. Mit zahlreichen gestochenen Tafeln. Halblederbände der Zeit. Alle sechs Mitteilungen in erster Ausgabe, in dieser Vollständigkeit selten. Sie tragen die nachfolgenden Überschriften: 1. Photochemische Untersuchungen, 2. Maassbestimmung der chemischen Wirkungen des Lichts, 3. Erscheinungen der photochemischen Induction, 4. Optische und chemische Extinction der Strahlen, 5. Die Sonne, 6. Meteorologische Lichtmessungen. - Bunsen und Roscoe legen hiermit den Grundstein für die messende Photochemie. Sie entwickeln dafür einen Apparat, mit dessen Hilfe sie das Lambertsche Absorptionsgesetz präzisieren können. Ihrer außerordentlichen Schwierigkeiten wegen bezeichnet Wilhelm Ostwald die photochemischen Untersuchungen als Bunsens Meisterarbeit. "Eine gleiche Summe von chemischer, physikalischer und rechnerischer Geschicklichkeit, von Scharfsinn im Ersinnen der Versuche und von Geduld und Ausdauer in ihrer Durchführung, von eingehendster Sorgfalt an jeder kleinsten Erscheinung und ausgiebigstem Weitblick der größten meteorologisch-kosmischen Verhältnissen gegenüber, findet sich in keiner anderen wissenschaftlichen Arbeit auf diesem Gebiete wieder" (Ostwald). - Stempel auf den Titeln. Mit kleinen Bibliotheksrückenschildern, sonst sehr gut erhalten. - DSB 2, 586; Poggendorff I, 341; Darmstaedter 554.

(London, Taylor and Francis, 1860). 4to. No wrappers as extracted from "Philosophical Transactions" 1859 - Vol. 149 - Part II. Pp. 879-926. Clean and fine. First appearance in English of a classic paper in the investigations of chemical reactions produced by lightrays. Their joined work - from 1855-59 - founded scientific photochemistry, by determining the phenomena of induction, deduction and extinction. They found that the beginning of light reaction takes place at first very slowly and that the velocity increases gradually until it attains a constant value, observing also that steam accelerates the action and that air retards it. They also gave proofs of the "Law of Reciprocity.

Leipzig, Johann Ambrosius Barth, 1855, 1857, 1859, 1862. Without wrappers as issued in "Annalen der Physik und Chemie. Hrsg. von J.C. Poggendorff". In 6 orig. parts (Heften) from vols. 96, 100 (2 Papers), 101, 108 a. 117. all with titlepage to the respective volumes. - The parts: pp. 373-512 a. 2 folded engraved plates - pp. 1-176 a. 2 engraved plates - pp. 481-660 a. 2 engraved plates. - pp. 161-320 a. 1 engraved plate. - pp. 193-368 a. 3 engraved plates. - pp. 529-660 a. 2 engraved plates.The Bunsen & Roscoe papers: pp. 373-394 - pp. 43-88 - pp. 481-516 - pp. 235-263 - pp. 193-273 - pp. 529-562. A small tear to one titlepage. All issues fine and clean. First printing of these 6 papers constituting the classical photochemical researches, - the papers laid the foundation for the science of quantitative photochemistry."Between 1852 and 1862 Bunsen collaborated with Sir Henry Roscoe on photochemical research involving the chemical combination of equal volumes of hydrogen and chlorine when they were illuminated.For this experiment they altered a reaction vessel devised by John Draper in 1843. Bunsen and Roscoe found that for some time after the experiment started - a time they called the induction period - no reation took place" then the reaktion rate slowly increased until a constant rate, proportional to the intensity of the light source used, was reached. The effect of the incident light was related to the wavelenght and followed a law of inverse squares.(they) determined that the energy of light radiated by the sun in one minute is equivalent to the energy needed for the conversion of 25x10 with a potens of 12 cubic miles of a hydrogen-chlorine mixture into hydrogen chloride."(DSB II, pp. 589).The papers contains the description of the ACTIONOMETER, which measures the heating power of electromagnetic radiation. The main use is to measure solar energy for meteteorological applications, Bunsen and Roscoe made this invention in order to carry out their researches here.The famous "BUNSEN BURNER" is first described here (in vol. 100 pp. 84-86). This invention furnished Bunsen & Kirchhoff with a non-luminous gas-flame of failrly high temperature, in which chemical substances could be vaporized and a spectrum could be obtained, due purely and simply to the luminous vapour.Leicester & Klickstein "A Source Book in Chemistry", pp. 355-360).

In: Annalen d. Physik u. Chemie 96, 100, 101, 108 u. 117. M. 26 Taf. Je Band ca. 650 S. In versch. Hlwd.- u. Ppbdn. Einbde. leicht bestoßen. Teils etwas braunfl. M. mehr. St. Poggendorff I, 341 u. II, 686. Erste Ausgaben. So vollständig selten! Die einzelnen Bezeichnungen lauten: 1. Photochemische Untersuchungen; 2. Maassbestimmung d. chemischen Wirkungen d. Lichts; 3. Erscheinungen d. photochemischen Induction; 4. Optische u. chemische Extinction d. Strahlen; 5. Die Sonne; 6. Meteorologische Lichtmessungen. Sprache: Deutsch 0 gr.