On making
microphotographs of firing pins or hammers, with special reference
to the rounded ends and also photographs of the corresponding
rounded depressions in the primers fired by them it is forced on
any one that cartridges fired by each individual rifle or pistol
can positively be identified.
"You will see on the edge of the photographs I have made a rough
sketch calling attention to the 'L'-shaped mark which is the chief
characteristic of this hammer, although there are other detailed
markings which show well under the microscope but not well in a
photograph. You will notice that the characters on the firing
hammer are reversed on the cartridge in the same way that a metal
type and the character printed by it are reversed as regards one
another. Again, depressions on the end of the hammer become raised
characters on the cartridge, and raised characters on the hammer
become depressions on the cartridge.
"Look at some of these old photographs and you will see that they
differ from this. They lack the 'L' mark.
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