23 AfPAftAtUS FOR BREAKING! VP LOGS OF WOOft* 



The following Articles iverefent to the Societj/. See Plate It* 

 Fig. 1 and 2. 



A, the rending or blowing (brew, with a wire B, for the 

 purpofe of occafionally clearing the touch-hole, previous to 

 / the introduction of the quick-match. 



C, an auger proper to bore holes, to receive the charge 

 of the fcrew. 



D, a gouge, to make an entrance for the auger. 



E, a lever, to wind the fcrew into the wood, with a leather 

 thong F attached to it, in order to fatten it occafionally to 

 the fcrew, to prevent its being loft, in cafe it fliould be thrown 

 out when the block is burft open ; a circumftance which does 

 not often occur : for in all my experiments, when the wood 

 has been tolerably found, I have always found the fcrew left 

 fixed in one fide of the divided mafs. 



A roll of twine is to be fteeped in a folution of nitre, for tha 

 purpofe of a quick match, or train, to difcharge the powder, 

 by thrufiinga piece thereof down the touch-hole, after taking 

 out the wire B. 

 Aceount of the The firft that was made was for J. Lloyd, Efq. of St. Afaph, 

 inftrument the ]. d { Q member for Flint, who, having a great quantity of 

 timber on his eftate, confiders it a confiderable acquifition ; 

 and at Overton-Hall, laft fummer, fpoke fo favourably of it, 

 in my prefence, to Sir Jofeph Banks, that he immediately fent 

 for his fraith, and requeiied I would give him the neceffary 

 inftruclions for making one ; but'as I left that part of Derby - 

 fhire foon after, I had not an opportunity of feeing it finifhed. 

 Since my return home, I have had feveral made, fimilar to 

 that which I now prefent to the Society, which are better 

 finifhed, and have (harper threads than (mith's in general have 

 an opportunity of giving them. 



Letter from Mr. Lloyd on the fame f abject. 



DEAR SIR, 



t of the AFTER you left us laft autumn, at Sir Jofeph Banks's, his 



ufe and applica- fmith, who is a remarkably good workman, beftowed much 



tionof the blaft- nee dlefs time and trouble in making a blafting-fcrew ; for he 



1115 finifhed it in the higheft flyle of pohfh, and, I think, made the 



thread of the worm too fine, or at leaft finer than was needful. 



However, it anfwered moft completely, and very much to 



Sir Jofeph's fatisfa&ion, who lamented he had not feen fuch a 



contrivance 



