Garret M. Bodine, of Williamsburgh, ?. Y., has invented an instrument or scale for measuring watch crystals, the nature of which consists in forming a base having a graduated scale with vertical and oblique lines upon it, so crossing and intersecting each other that a very slight variation of the size of the glass will be readily observed by the angles formed by the lines ; this gives the utmost accuracy to the adjustment of watch crystals, and remedies a difficulty which watch makers have heretofore frequently experienced in fitting the glasses to watches. The inventor has taken measures to secure a patent.