IMPROVED GUN LOCK, ^ ^ 



foldler or workman: 2. It is difcharged very (peedlly, and 

 cannot poffibly catch or hang at the half cock in the a6l of dif- 

 charging: 3. The bearing parts at half cock are extremely 

 iirong and cannot mifs their hold or be thrown out of taking 

 bv any accident. 'In particular the trigger cannot be made to 

 remove (he fear; becaufe its a6lion at half cock is in the con- 

 Irarj' diredion. Hence it is much more (imple and its means of 

 fafi'ty are nearly as fecure as any boU, that is to fay it is p«rfedly 

 elfe^^iial as far as regards the trigger; though it does not, like 

 fome of the bolt flops, prevent the full cock being made. But 

 on the other hand, as the inventor remarks, its fecurity in no 

 refpe<5t diminifhes its ready ufc For bolts, excluiive of the 

 additional expence, have the difadvantageof requiring a pre- 

 vious operation before the piece is fit for fervice. Few people 

 when alarmed have the prefence of mind to unbolt, but they 

 inftantly attempt to cock. Difappointment tends to produce 

 that agitation and confufion of mind which, at fuch a jundure, 

 Tviay occafion the lofs of their lives from opponents who are 

 little difpofed to ftiew mercy to an enemy from whom they 

 had no reafon to expe6t an}'. 



Certificates of the utility and novelty of this invention, from 

 refpedable makers, with letters of approbation from the Board 

 of Ordnance, were exhibited to the Society of Arts; and it is 

 probable that this apparatus will obtain the encouragement it 

 appears to deferve. The Society expreffed their fentiments 

 by awarding the iilver medal with the fum of ten guineas to 

 the inventor. 



VIII. 



Itivefiigafion of the Properties of the Lines draun in a Cirde by 

 Mr BoswElL i?t tU Tenih Foiitme of thU Journal B^f Mr, 

 John Gough, 



Tq Mr. NICHOLSON. 

 SIR, Middle/haw, April 17, 1805. 



A HE theorem^ refpe^ling the circle, given in your number Propofuiont 

 for xMarch lafl by the ingenious Mr. Bofwell, will undoubtedly ^f^'Pf^^^g the 



Circle S 2T£2 aCCm 



prove ufeful to the «rtift and pr^dic^l philofopher. On this * 



: account 



