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peded, and may perhaps be entirely fruſtrated, by the action of the ſprings; it muſt appear that great patience and perſeverance, as well as great ingenuity, will be required; to give any chance of ſucceeding in the attempt. I do not ſtate this circumſtance, as a point eſſential, or of any importance to the purpoſe of the Lock, but to prove more clearly, what I have before obſerved upon its principle, and properties: for, if ſuch difficulties occur to a ſkilful workman, as to render it almoſt, if not altogether, impracticable, to form a key, when the Lock is open to his inſpection, and its parts acceſſible to his hand; it pretty clearly demonſtrates, the impoſſibility of accompliſhing it, when, no part of the movement, can be touched or ſeen.
It will naturally be imagined by the reader, that the ſame difficulties, which occur in the formation of a key, in the ſecond inſtance, muſt have been experienced by the maker of the Lock; and that, however inſuperable
