PREFACE.

Butterfield's "The Chemistry of Gas Manufacture."

(Griffin.)

Cripps' "The Guide Framing of Gas-holders." (King.)
Dibdin's "Practical Photometry." (King.)

"Gas-burners, Old and New." (King.)
Humphrys, "The Chemistry of Illuminating Gas."

(King.)

BECKTON,

King's "Treatise on Gas Manufacture." 3 vols. (King.)
The article on "Coal-Gas," contributed by Mr. L. T.
Wright to Thorpe's "Dictionary of Applied Che-
mistry." (Longmans.)

The "Journal of Gas Lighting."

December, 1895.

ix

b

J. H.

INTRODUCTION.

CONTENTS.

CHAP.

I. The Characteristic Properties of the Various Kinds of

Coal, and their Value for Gas-making Purposes

II. Carbonization

III. The Description and Arrangement of Apparatus em-

ployed for the Conveyance of the Gas immediately

upon its leaving the Retorts

IV. Labour-Saving Appliances in the Retort-House, and

in the Working of Retorts.

V. The Effects of Temperature in Modifying the Quantity

and Quality of the Gas produced

VI. The Effects of Temperature upon the Production of

Residuals

VII. Purification (Condensation)

VIII. The Exhauster

IX. Purification (Abstraction of the Ammonia)

X. Purification (Elimination of CO2, SH2, and CS2)

XI. The Simplest Methods of Ascertaining the Purity and

Illuminating Power of Gas

XII. A Description of the Various Instruments used in Gas-

Works for Ascertaining and Recording Pressure and

Exhaust

PAGE

1

133

139

153

XIII. The Gas-holder and its Tank

XIV. The Practice of Photometry.

XV. The Methods employed for Controlling Pressure at

the Works so as to secure an adequate supply of

Gas at the various points of Consumption, with a

due regard for Economical Effect

175

CHAP.

XVI. The Laying of Mains and Service Pipes

XVII. The Construction of Gas Meters

XVIII. Gas Burners

APPENDIX:

XX. The Composition of Coal-Gas

XXI. The Enrichment of Coal-Gas

XXII. The Manufacture of Sulphate of Ammonia

The Referee's Sulphur Test

Spent Oxide of Iron Test.

XIX. Influence of Temperature and Pressure upon the

Volume of Gas

INDEX

Specimen Examination Papers of the City and Guilds of

London Institute in Gas Manufacture

PAGE

185

203

217

227

233

242

249

252

254

256

261

FRONTISPIECE.

LIST OF PLATES.

TOOLS EMPLOYED IN THE RETORT-HOUSE .

PATENT "STANDARD" WASHER-SCRUBBER.

WATER-GAS PLANT

PEEBLES OIL-GAS PLANT

SULPHATE OF AMMONIA PLANT

PAGE

34

106

244

246

250