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I. Extract from a Letter on the practical appli-cation of the Wire-gauze Safe-lamp, from JohnBuddle, Esq. to Sir H. Davy.

WalPs-end Colliery, Newcastle,1st June, 1816 .

“ After having introduced your safety-lamp into general use in all the collieriesunder my direction, where inflammable airprevails; and after using them daily inevery variety of explosive mixture for up-wards of three months, I feel the highestpossible gratification in stating to you, thatthey have answered to my entire satisfac-tion.

The safety of the lamps is so easilyproved, by taking them into any part of amine, charged with fire-damp, and all theexplosive gradations of that dangerous ele-ment, are so easily and satisfactorily ascer-tained by their application, as to strike theminds of the most prejudiced with thestrongest conviction of their high utility;and our colliers have adopted them withthe greatest eagerness.

In the practical application of the lamps,scarcely any difficulty has occurred. Those