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Sold only by the Superintendent of Documents, Government Printing Office
Washington, D. C.
WASHINGTON
GOVERNMENT PRINTING OFFICE
1926
Library
TN 23
.U581 b No.197
CONTENTS
Foreword..
Acknowledgments_.
Introduction to Bulletin 42__
Collection of samples of mine gases.
Sampling by the vacuum method___.
Sampling where there is appreciable air movement_
Sampling in still air_
Sampling by air displacement_-_
Sampling by water displacement.
Water as displacing fluid_
Procedure for sampling---
Checking the reading of a flame safety lamp_.
Determination of moisture
Use of wet and dry bulb thermometers___.
Laboratory apparatus for the determination of moisture in mine air_.
Analysis of mine atmospheres‒‒‒‒
Reasons for using precise methods_.
Older types of apparatus___.
Modified Haldane apparatus_-
Application and use__.
Factors affecting the accuracy of analysis_-_.
Change of temperature and pressure during the analysis___
Change of water-vapor content.
Solubility of gas in confining liquid__.
Solubility of gases by absorbents_.
Graduation of the burette__.
Description of apparatus_‒‒‒
Burette and pipettes-.
Transfer of samples..
Electric connections____
Other parts of apparatus_.
Preparing the apparatus for use-
Greasing the stopcocks---.
Testing for tightness--.
Preparation of solutions___
Caustic potash solution_.
Caustic soda solution__‒‒
Alkaline pyrogallate solution_.
Potassium pyrogallate solution..
Sodium pyrogallate solution.
Procedure for analysis..
Taking gas into apparatus__-
Test for carbon dioxide_
Removal of oxygen-.
III
Analysis of mine atmospheres-Continued.
Modified Haldane apparatus-Continued.
Determination of combustible gas----
Calculations for determining combustibles_.
Methane and carbon monoxide_.
Methane and hydrogen__.
Hydrogen and carbon monoxide____
Hydrogen, methane, and carbon monoxide___
Calculation of results___.
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Haldane apparatus for precise analysis of methane_-_.
Portable apparatus for the determination of methane in mine air___.
Use of a storage battery or resistance bank_____
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33
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35
Portable apparatus for the determination of carbon dioxide and methane___
335
Simple portable gas-analysis apparatus for complete analysis of
mine air_.
Copper oxide apparatus for complete analysis of gases-Continued.
Notes on operation of apparatus____.
52
Description of apparatus___
Use of water in burette and combustion pipette-
Solubility of gases in absorbents____
Solubility of methane and ethane in fuming sulphuric acid and
cuprous chloride solution____.
Action of fuming sulphuric acid on Pittsburgh natural gas---
Elimination of errors due to physical absorption___
Graduation of the burette_____
Capillary error of the apparatus_
Formation of oxides of nitrogen__.
Distillation of mercury.
Description of mercury still____.
Description of still with electric heater___
Electric heater___.
Care of apparatus---
Laboratory container for holding gases over mercury.
Simplified apparatus for determining carbon monoxide_.
Iodine pentoxide apparatus using liquid air.
Determination of carbon monoxide by the pyrotannic acid method_-_-
Apparatus necessary for test-----
Procedure for testing for carbon monoxide_
Sampling the gas--.
Analysis-----
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