Page:A Dissertation on the Construction of Locks (1785).pdf/26

 likewiſe with correſpondent niches on the upper ſide, into which the hooks are driven, if any greater force be applied to the tumblers, than is required to diſengage them from the bolt.—Hence it becomes abſolutely neceſſary in the fabrication of a falſe key, that the preſſure of the extreme point of its bit on the tumblers, be proportioned with the greateſt degree of exactneſs to the point of height to which they muſt be raiſed, to releaſe the bolt; for otherwiſe the power which diſengages the hooks on the one ſide will fix them on the other, and ſtill leave the bolt immoveable. This improvement, which does great credit to Mr. Baron’s mechanical ſkill and invention, being as uſeful and important in effect, as it is new and curious in principle, muſt be admitted by every competent and impartial judge, to be a very valuable acquiſition to the art of Lock-making.—But greatly as the art is indebted to the ingenuity of Mr. Baron, he hath not yet