Page:A Dissertation on the Construction of Locks (1815).pdf/49

 The imperfections and defects which are common, in some degree, to all other Locks, being thus remedied; and the principle here adopted being an infallible security against the best directed efforts of the picklock, or any similar instrument of violation; I may, without presumption, lay claim to the credit of having brought the art of Lock-making to that perfection which hath been long sought, but which hitherto hath been sought in vain.

It is presumed, that what has been already advanced, has clearly acquainted the attentive reader with the principle and properties of the invention which it is the object of this short treatise to explain; it may not however be unnecessary to introduce a concise review of the advantages afforded by this new principle, which are as follows: viz.

1st. The use of the pick-lock is totally and effectually excluded.

2nd. No instrument but that which is an exact duplicate of the key can have the capacity of opening the Lock.

3rd. There is no possibility of obtaining the form of the key by impression.