TEST APPARATUS, FOR CERTIFYING THE PURITY OF COAL GAS, AND THE PROPER MANNER OF WORKING THE LIME MACHINE 157 BEST METHOD OF PREPARING QUICK-LIME FOR THE PURIFICATION OF COAL GAS 161 PART IX. GAS HOLDER 164 GAS HOLDER AS ORIGINALLY EMPLOYED 165 GAS HOLDER WITH GOVERNOR, OR REGULATING GUAGE, LATELY BROUGHT INTO USE 169 GAS HOLDER WITH GOVERNOR OR REGULATING GUAGE AT THE CHESTER GAS WORKS 175 GAS HOLDER WITH GOVERNOR OR REGULATING GUAGE AT THE BIRMINGHAM GAS WORKS 177 REVOLVING GAS HOLDER AT THE WESTMINSTER GAS WORKS 181 RULE FOR FINDING THE CAPACITY OF A REVOLVING GAS HOLDER OF GIVEN DIMENSIONS 185 COLLAPSING GAS HOLDER 185 RULE FOR FINDING THE CAPACITY OF A COLLAPSING GAS HOLDER OF GIVEN DIMENSIONS 195 RECIPROCATING SAFETY VALVE 196 PART X. GAS METRE, OR SELF-ACTING GUAGE, WHICH MEASURES AND REGISTERS, IN THE ABSENCE OF THE OBSERVER, THE QUANTITY OF GAS PRODUCED IN A GIVEN TIME, FROM ANY GIVEN QUANTITY OF COAL, OR CONSUMED DURING A GIVEN PERIOD, BY ANY NUMBER OF BURNERS OR LAMPS 200 DESCRIPTION OF THE GAS METRE AT THE ROYAL MINT GAS WORKS 214 RULE FOR CALCULATING THE WEIGHT, WHICH A GAS METRE OF GIVEN DIMENSIONS, WILL RAISE, TO A GIVEN HEIGHT, IN A GIVEN TIME 220 GAS HOLDER VALVE 221 SIPHON, OR WATER RESERVOIR 221 PART XI. GOVERNOR OR REGULATING GUAGE 225 DIRECTIONS TO WORKMEN FOR FIXING THE GOVERNOR AND GAS METRE 229 PART XII. GAS MAINS AND BRANCH PIPES 239 WEIGHT OF CAST IRON GAS MAINS OF DIFFERENT LENGTHS AND BORES 251 PART XIII. GAS LAMPS AND BURNERS 253 DIRECTIONS TO WORKMEN, FOR ADAPTING GAS PIPES TO THE INTERIOR OF HOUSES 258 PART XIV. ILLUMINATING POWER OF COAL GAS, AND QUANTITY OF GAS CONSUMED IN A GIVEN TIME, BY DIFFERENT KINDS OF BURNERS, AND GAS LAMPS 269 PART XV. GAS FROM COAL TAR 282 GAS FROM OIL 289 PART XVI. OTHER PRODUCTS OBTAINABLE FROM COAL, NAMELY: