4,4 - DESCRIPTION OF A NEW PADLOCK. 



Dcfcription of a or Upon a fmall fteel toolh, which is attached to the firft interior 



padlock of com- ]i„je thg ]g^gr O of the fecond ring on the tooth of the 



fecond cylinder; the letter C of the third ring on the tooth of 



the third cylinder; and laflly, the letter K of the fourth tooth 



on the fourth cylinder. 



By this means the word lock is fet up and becomes the com- 

 bination of the lock, and the word Rome no longer produces 

 the difpofition of parts required for the difengagement. 



After tliis operation the fcrew muft be replaced in the centre 

 of the plate ; this fcrew does not contribute to the flrengtb of 

 the mechanifin ; but is ufed merely to allow the exa6t fpace 

 neceflary for opening the padlock, and to prevent the fepara- 

 tion of the rings from the central parts in the common ufe of 

 the lock. 



Method of ufing this Lock as a Defence to the Key-hole of a Door. 



A ring ftaple A, having a wood fcrew, is fixed to the door 

 above the key-hole or efcutcheon cf the lock. 



A fecond ring C is fixed perpendicularly beneath the other. 



A cylindrical tube of iron D, in the form of a bolt, is placed 

 vertically in the ring of thefe fcrew flaples. At the lower 

 end of the tube is an aperture, through which the padlock is 

 inferted, fo that the tube or bolt cannot be raifed or taken 

 out. 



By this contrivance the key-hole of the lock is completely- 

 defended, and the introduction of a pick-lock or falfe key is 

 "tendered morally impoffible. For the mechanifm prefents 

 331,776 combinations, * forming 331,775 different obftacles, 

 to prevent the removal of this defence by any perfon unac- 

 quainted with the fecret of the proprietor. 



If it be apprehended that the word of the combination may 

 be forgotten, it will be eafy to write and difguife it in many 

 different wa}s, without any rifk of difcovery: for example. 



The letter L, or eleventh letter of the alphabet £. 



will be written 1 1 . 



The letter O, or fourteenth letter - - - - 14. 



The letter C, or third letter 3. 



The letter K, or tenth letter - - - - 10, 



Total (expreffed) £. 33. 



* Number equal to the 4th power of 24, 



This; 



