Page:A Dissertation on the Construction of Locks (1785).pdf/17

 only, to induce a falſe confidence in their effect; and to throw temptation to diſhoneſty in the way of thoſe who are acquainted with their imperfections, and know their inefficacy to the purpoſe of ſecurity.—Having diſpatched this part of my ſubject, I ſhall proceed to the ſpecification of a Lock, which by great application and expence, I have completed, and now offer to the public as a perfect ſecurity againſt every poſſible effort of art and ingenuity; and which I ſubmit to the moſt critical inveſtigation of curious, and ſkilful judges, with a confidence which aſſures me, that their judgement and teſtimony will do credit to the inventor, by confirming the efficacy, the infallibility, and the originality of the invention.

The principle on which all Locks depend, is that of applying a lever to an interior bolt by means of a communication from without, which moves it in ſuch direction as the lid, drawer, or door to be ſecured may require.