INDEX. 



207 



Gas, coal, analysis of page 40 



.corrections for moisture contained 



in > . . . v . . . 47 



, illuminating powers of ... 45 



, mode of ascertaining 4 1 



, impurities contained in ... 108 



, , how detected . . .119 



, table of 50 



, purification of 108 



, quantities obtained by experiment 



from different kinds of coal 37 



, specific gravity of 46 



, cyanogen 33 



, nitrogen 32 



, olefiant 30 



, sulphuretted hydrogen 31 



Gas-meter . . 122 



-, dimensions and prices of 



Gasometer . 

 , curb of . 



129 

 130 

 131 

 132 

 143 



-, outlet- and inlet-pipes, . . . 



-, pressure of 



-, tanks for 133 



, estimates for 139 



, iron . .134 



, telescope ib. 



Gas-regulator 196 



Gas-works, Peter Street, Westminster . . 17 



, country, outlay and income of . 55 



, situation for 166 



Governor 145 



Grafton's patent fire-clay retort .... 90 



Gauge, pressure 151 



, pyrometric 39 



Guildhall lighted with coal-gas .... 20 

 Heat, proper degree of, for the distillation of 



coal ,. !,,.._ . 39 



Hydraulic main 64 



valves 28, 155 



Hydrogen gas, properties of 28 



Illumination, general 6, 19 



Illuminating power of gases 43 



Impurities in gas 108 



Index of station-meter page 124 



Indicator, pressure 149 



Jermyn, Mr. G. A., on maps of towns . . 184 



Joints 62 



, retort mouth-piece ib. 



of street-mains 161 



.elastic 163 



.water 112.136 



Kirkham's method of clearing retorts ... 75 



Lids of retorts 62 



, mode of securing . . . . 76 



Lime, qualities of 121 



, quantity required to purify coal-gas . 117 



purifier first used 14 



Lowe's, Mr., reciprocating retort .... 81 



Luting 62 



Manure, ammoniacal liquor used as ... 204 



Mains, street 159 



, distribution of gas through . .166 



, joints for 161 



, , sockets of 159 



, valves for 157 



Manufacture of carbonate and muriate of am- 

 monia 204 



Meter 21, 122 



, consumers 126 



, dry 22 



, station 122 



, index of 124 



Milne's gas-regulator 196 



Mortar, proportions of 105 



Naphtha 200 



, impregnation of gas with .... ib. 



Nitrogen, properties of . . ..... 32 



(Economy of lighting small towns with gas 54 



Olefiant gas, properties of 30 



, presence of, how detected . . 43 



Oven-plan of setting retorts 69 



Oxygen gas, properties of 27 



, quantity required for the com- 

 bustion of different gases 45 



Palmer's (Mr. G. H.) purifier 120 



Photometer . 41 



