26 Account of Mr Forrest's New Percussion Lock. 
Fig. 2. is another representation of the lock after being fired. 
This is given for the purpose of shewing how the magazine in 
the hollow of the hammer C is thrown back, out of the reach of 
contact with the flash from the explosion in the pan, and in 
what manner the punch at the point of the cock descends into 
the pan, when the trigger is pulled to set off the piece. 
Fig. 3. is a lateral representation of the finger-screw seen at 
D, Fig. 1. This view of the figure also shews a steel cylinder, 
which is interposed between the magazine and the pan, for the 
double purpose of security against accident from the contact of 
the one with the other, and for measuring off the proper quan- 
tity of powder requisite for one discharge. The small hollow 
in the cylinder where the priming lodges is seen at A. 
Fig. 4. is a section of the magazine, the cylinder, the pan, 
and the funnel through which the fire is conveyed to the barrel. 
A is the magazine, B the cylinder, C the pan, D the funnel ; 
E is the small hollow in the cylinder in which the priming pow- 
der lodges before the cylinder is turned round by the finger- 
screw, and emptied into the pan. 
Fig. 6. is a representation of the other side of the magazine 
next to the barrel, where there is placed a spring which catches 
into a nick at the end of the cylinder, and indicates when the 
priming powder is emptied into the pan, and when the cy- 
linder is again turned round to its proper position. A is the 
spring, B the nick, C is the spring, seen apart from the side of 
the magazine. 
I hope it will now be understood, that the excellence of this 
invention consists chiefly in the well judged intervention and 
position of the cylinder betwixt the pan and the magazine, 
which arrangement completely prevents all possibility of any 
accident ; for, by an examination of the diagram, or rather en- 
larged section of this part of the apparatus, given at Fig. 7., it 
will be seen, that at no point whatever, during the process of 
turning round the cylinder to fill the pan^ is the powder in the 
magazine ever brought in contact with that point. Let it be 
supposed that A represents the hollow of the cylinder where the 
powder is lodged, and in its present position letting the con- 
tents fall into the pan, it is obvious that no communication with 
