Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 414
e thickness ofrolled plates of brass, and sold at the tool-shops, answers this pur] o>every well; but Rosss lever of contort (fig. 324), devised for thisexpress purpose, is in many respects preferable. This consists of asmall horizontal table of brass, mounted upon a stand, and havingat one end… … Fig. 324.—Rosss lever of contact. •delicate lever of steel, whose extremity points to the graduated arc,whilst it has very near its pivot a sort of projecting tooth, whichbears it against a vertical plate of steel that is screwed to thehorizontal table. The piece of thin glass to be measured being…
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