1814.] On the Ventilatim of Coal-Mines. 20t 



tical men sliould receive with doubt tlie proposals of new projects. 

 I submit my own with deference to those who have the manage- 

 ment of collieries, of which 1 profess to know very little, with this 

 remark, that they may satisfy themselves ot its use where it has 

 long been employed, and that though I admit that the vitiation of 

 the air takes place in these mines from a very different cause, and 

 in a different manner, yet I conceive the cases are sufficiently 

 analogous to justify a trial of it, where something is so much 

 wanted. I am, Sir, 



Your obedient servant, 

 , . _ , - iQiA John Taylor. 



Stratford, Essex, Jan. 7, 1814. 



APPENDIX. 



To give the reader an idea of the nature of this machine, we 

 have thought it requisite to give a figure of it, and we extract the 

 following description of it from Mr. Taylor's paper, printed in the 

 Transactions of the Society for the Encouragement of Arts, Manu- 

 factures, and Commerce, for 1810 : — 



" I at last erected the machine, of which the annexed is a 

 drawing j 



which, while it is so simple in construction, and requires so 

 small an expence of power, is so coin[)lctc in its oju'ration, and 

 its parts arc so little liable to be injured liy wear, that, as far as I 

 can imagine, nothing more can be desired wbero such an one is 

 Hpi)lled. This engine bears considerable resemblance to Mr. Pepy's 



