PREFACE.
The extraordinarily rapid progress which the recentinvention of lighting with coal gas has made in thiscountry, is perhaps without a parallel in the history ofthe useful arts.
It was an invention not exempted from the misfortunecommon to all innovations on established practises, ofencountering opposition, but it had the fortune commonto few, of obtaining an almost instantaneous triumph.
A single exhibition of the gas lights in actual usewas sufficient to determine the public judgment in favourof the new mode of illumination ; to see was in this case,indeed to believe.
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