Book contents
- Frontmatter
- PREFACE
- Contents
- Obituary Notice
- 1876: Note on Certain Formulæ in the Calculus of Operations. (In a letter to Prof. Tait)
- 1876: An Experiment on Electro-Magnetic Rotation
- 1887: On the Foci of Lines seen through a Crystalline Plate
- 1877: On Certain Movements of Radiometers
- 1878: On the Question of a Theoretical Limit to the Apertures of Microscopic Objectives
- 1878: On an Easy and at the same time Accurate Method of Determining the Ratio of the Dispersions of Glasses intended for Objectives
- 1879: On a Method of detecting Inequalities of unknown periods in a series of Observations. (Note appended to a paper by Prof. B. Stewart and W. Dodgson)
- 1880: Description of the Card Supporter for Sunshine Recorders adopted at the Meteorological Office
- 1881: On a Simple Mode of Eliminating Errors of Adjustment in Delicate Observations of Compared Spectra
- 1881: Discussion of the Results of some Experiments with Whirled Anemometers
- 1878: On the Determination of the Constants of the Cup Anemometer by Experiments with a Whirling Machine
- 1881: Note on the Reduction of Mr Crookes's Experiments on the Decrement of the Arc of Vibration of a Mica Plate oscillating within a Bulb containing more or less Rarefied Gas
- 1882: On the Cause of the Light Border frequently noticed in Photographs just outside the Outline of a Dark Body seen against the Sky: with some Introductory Remarks on Phosphorescence
- 1882: Extracts from Reports of the Committee on Solar Physics
- 1882: Memorandum for the use of Observers with Professor Balfour Stewart's Actinometer, prepared by Professor G. G. Stokes, Sec.R.S., and adopted by the Committee on Solar Physics
- 1883: On the Highest Wave of Uniform Propagation. (Preliminary notice)
- 1880: On the Maximum Wave of Uniform Propagation, being a Second Supplement to a Paper on the Theory of Oscillatory Waves. (Not before published)
- 1891: Note on the Theory of the Solitary Wave
- 1895: The Outskirts of the Solitary Wave
- 1885: On a remarkable Phenomenon of Crystalline Reflection
- 1886: The Coefficient of Viscosity of Air
- 1889: Note on the Determination of Arbitrary Constants which appear as Multipliers of Semi-convergent Series
- 1891: On a Graphical Representation of the Results of Dr Alder Wright's Experiments on Ternary Alloys
- 1891: On an Optical Proof of the Existence of Suspended Matter in Flames
- 1891: On the Reactions occurring in Flames
- 1891: The Influence of Surface-Loading on the Flexure of Beams
- 1892: On the best Methods of Recording the direct Intensity of Solar Radiation
- 1896: On the Nature of the Röntgen Rays
- 1897: On the Nature of the Röntgen Rays (Wilde Lecture)
- 1898: Mathematical Proof of the Identity of the Stream Lines obtained by means of a Viscous Film with those of a Perfect Fluid moving in Two Dimensions
- 1902: On the Discontinuity of Arbitrary Constants that appear as Multipliers of Semi-Convergent Series
- 1886: On the Methods of Chemical Fractionation
- 1903: The Ultra-Violet Spectrum of Radium
- APPENDIX (Mathematical Tripos and Smith's Prize questions)
- INDEX
1886: On the Methods of Chemical Fractionation
Published online by Cambridge University Press: 01 June 2011
- Frontmatter
- PREFACE
- Contents
- Obituary Notice
- 1876: Note on Certain Formulæ in the Calculus of Operations. (In a letter to Prof. Tait)
- 1876: An Experiment on Electro-Magnetic Rotation
- 1887: On the Foci of Lines seen through a Crystalline Plate
- 1877: On Certain Movements of Radiometers
- 1878: On the Question of a Theoretical Limit to the Apertures of Microscopic Objectives
- 1878: On an Easy and at the same time Accurate Method of Determining the Ratio of the Dispersions of Glasses intended for Objectives
- 1879: On a Method of detecting Inequalities of unknown periods in a series of Observations. (Note appended to a paper by Prof. B. Stewart and W. Dodgson)
- 1880: Description of the Card Supporter for Sunshine Recorders adopted at the Meteorological Office
- 1881: On a Simple Mode of Eliminating Errors of Adjustment in Delicate Observations of Compared Spectra
- 1881: Discussion of the Results of some Experiments with Whirled Anemometers
- 1878: On the Determination of the Constants of the Cup Anemometer by Experiments with a Whirling Machine
- 1881: Note on the Reduction of Mr Crookes's Experiments on the Decrement of the Arc of Vibration of a Mica Plate oscillating within a Bulb containing more or less Rarefied Gas
- 1882: On the Cause of the Light Border frequently noticed in Photographs just outside the Outline of a Dark Body seen against the Sky: with some Introductory Remarks on Phosphorescence
- 1882: Extracts from Reports of the Committee on Solar Physics
- 1882: Memorandum for the use of Observers with Professor Balfour Stewart's Actinometer, prepared by Professor G. G. Stokes, Sec.R.S., and adopted by the Committee on Solar Physics
- 1883: On the Highest Wave of Uniform Propagation. (Preliminary notice)
- 1880: On the Maximum Wave of Uniform Propagation, being a Second Supplement to a Paper on the Theory of Oscillatory Waves. (Not before published)
- 1891: Note on the Theory of the Solitary Wave
- 1895: The Outskirts of the Solitary Wave
- 1885: On a remarkable Phenomenon of Crystalline Reflection
- 1886: The Coefficient of Viscosity of Air
- 1889: Note on the Determination of Arbitrary Constants which appear as Multipliers of Semi-convergent Series
- 1891: On a Graphical Representation of the Results of Dr Alder Wright's Experiments on Ternary Alloys
- 1891: On an Optical Proof of the Existence of Suspended Matter in Flames
- 1891: On the Reactions occurring in Flames
- 1891: The Influence of Surface-Loading on the Flexure of Beams
- 1892: On the best Methods of Recording the direct Intensity of Solar Radiation
- 1896: On the Nature of the Röntgen Rays
- 1897: On the Nature of the Röntgen Rays (Wilde Lecture)
- 1898: Mathematical Proof of the Identity of the Stream Lines obtained by means of a Viscous Film with those of a Perfect Fluid moving in Two Dimensions
- 1902: On the Discontinuity of Arbitrary Constants that appear as Multipliers of Semi-Convergent Series
- 1886: On the Methods of Chemical Fractionation
- 1903: The Ultra-Violet Spectrum of Radium
- APPENDIX (Mathematical Tripos and Smith's Prize questions)
- INDEX
Summary
When the balance of affinities, of which I spoke above, seems to be established, and the earths appear in the same proportion in the precipitate and the solution, they are thrown down by ammonia, and the precipitated earths are worked up by some other process so as to alter the ratio between them, when the previous operation can be again employed.
fractional precipitation by ammonia is the process generally adopted, for although in some cases it is not so powerful as other processes it is more generally applicable. There are three different methods of operating. According to one plan one-third the equivalent quantity of ammonia is added; then, after the precipitate has quite settled, it is filtered, to the filtrate one-third more ammonia is added, and the precipitate is again filtered off. The remainder of the bases present are then fully precipitated. In this way the earths are divided into three parts, which I will designate − 1, 0, and + 1. Each of these lots is then treated as just described, and the thirds are added to the vessel on each side. This plan is rapid in the actual separations, but I think more time is spent in the extra filterings and washings than is saved in the lessened number of operations.
The second plan was one which was proposed by Prof. Stokes, with whom I have frequently discussed the subject of fractionation.
- Type
- Chapter
- Information
- Mathematical and Physical Papers , pp. 288 - 292Publisher: Cambridge University PressPrint publication year: 2009First published in: 1905