DISCLOSURE OP MANUFACTURING PROCESSES. 105 



If rubies and fapphires be clafTed with corindon, as many Probability that 

 mineralogifts feem difpofed to do, Europe will probably have fy"7the"precioo« 

 mines of thefe precious ftones as it already has mines of erne- gems. 

 raids, fuch as thofe of Limoges, difcovered bv the learned 

 Lelievre, counfellor of the mines. But thefe ftones will be 

 rubies, fapphires, and emeralds of mineralogifts, but not of 

 the jewellers, until they ftiall be found very tranfparent, 

 which I hope will be the fruit of new refearches, followed 

 with perfeverance. 



HERMENEGILDE PINI. 



IX. 



Qn difdofmg the Procefs of Mamif a Stories, In a Letter from 

 Mr. John Clennell. 



To Mr. NICHOLSON. 



My D^ A R Sir, Nevocaftle^ Feb, 17, 1805. 



Jl ERMIT me to Intreat the attention of fome of your nu- interefting quef- 

 merous correfpondents towards a (jueftion wliich muft cer- [h"d^^fc^ofu'e^of 

 tainly be interefting to every manut'adurer, but of which no manufafturing 

 regular difcuflion has yet been ofiered — Is it proper or im- procefles. 

 proper to lay before the public in reipe£lable periodical works, 

 a full and impartial ftateraent of the various procell'es of oar 

 manufactories ? I ftiall ftate fuch peafons as have offered 

 themfelves to me why they fliould be dilplayed, but I am 

 principally anxious to receive further information on a fubjedl 

 that appears to me peculiarly interefting. 



The firft argument I fliall adduce is that of Mr. Boyle, as 

 quoted by Dr. Johnfon in the 201ft number of the Rambler. 

 " The excellency of manufaflures, and the facility of labour. Argument of 

 would be much promoted, if the various expedients and con- "■^ '* 

 trivances which lie concealed in private hands, were, by 

 reciprocal communications, made generally known ; for there 

 are few operations that are not performed by ojae or another 

 with fome peculiar advantages, which, though fmgli/ of little 

 importance, woMthy conjunBion and concurrence, open new 

 inlets to knQvvledge, and give new powers to diligence," 



The 



