THE EOYAL ARTILLERY INSTITUTION. 
249 
it handier, better adapted to withstand rough usage, and easier to load and 
withdraw. 
Fig. 6 is a full size sketch of a copper rim fire cartridge for Spencer’s 
repeating rifle with enlarged powder chamber. Fig. 7 is a full sized sketch 
Pig. 6. 
Fig. 7. 
of a cartridge of similar construction suitable for a calibre of 0’5 inch and 
carrying 75 grains of powder and 500 grain bullet. It would weigh altogether 
about 700 grains or -g^th of a lb. The value of the copper in 100 of them 
would be less than 2s. 
