Stanley Matthews

“ No other witness on the part of the complainant is able to prove the fact of a variation of eccentricity between the rollers used by the defendant, while, on the other hand, the testimony on the part of the defendant does not permit us to doubt that the rollers used in its locks are identical in their eccentricity and shape. If, therefore, a variation of eccentricity in the rollers is a material feature of the invention, or is made material by the description and claim of the patent, no infringement has been proved. ”

“ It does not meet and answer the difficulty to say, as has been suggested in argument, that although the rollers in the defendant's locks may be of the same eccentricity and shape as respects each other, yet that when in revolution they vary in eccentricity in reference to the cam which operates them, so that in action their eccentricity varies, and the same result is produced ”

“ This lock is an improvement upon that of Linus Yale, in which an eccentric roller is combined with the cam for disconcerting the action upon tumblers. The invention consists in combining with the cam an arrangement of two or more eccentric rollers, of varying eccentricity, turning upon the same bearing, so that in revolving one or both may turn and alternate in action, thereby greatly increasing the difficulty of mapping out or locating the position of either.'
'General Description. In the drawings A represents the case of the lock ”