Notes
Pat. March 11, 1890. (#423,284) by Morris F. Smith of New Haven, Connecticut. Only known machinist tool by R. H. Brown & Co.
Micrometer shaped slide Caliper.
He must have worked for or owned R. H. Brown & Co., which did make a real micrometer, and later Starrett bought the patents. It is the beam mic with the 6 holes for pins in the bar. (Wm. Robertson)