BUNSEN, ROBERT & HENRY E. ROSCOE. - INTRODUCING THE "BUNSEN BURNER" AND THE "ACTIONOMETER".

Photochemische Untersuchungen I.-VI. Abhandlung. (1. Erste Abhandlung - 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. (6 Theile, alles).

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).

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