Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 265
without adjustment, which are correctedto a particular standard (§ 17). A small screw-gauge of steel,made for measuring the thickness of rolled plates of brass, andsold at the Tool-shops, answers this purpose very well; but RosssLever of Contact (Fig. 119), devised for this express purpose, is… … Rosss Lever of Contact. an inch, so that the entire arc measures l-50th of an inch ; at theother end is a pivot on which moves a long and delicate lever ofsteel, whose extremity points to the graduated arc, whilst it hasvery near its pivot a sort of projecting tooth, which bears at *against a…
Microscopy · Biology
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