This invention is designed to facilitate the acquirement aspect. This is due to the small number of workmen re- the inner flange. Two others, annealed for about sixteen of the elements of arithmetic by young children. As is well hours, turned out quite sound. quired to look after the machinery.… … strewing a coarsely grained llux on a cylinder of glass while the outer flange, these plates, even of the lower or 8. quality, still red hot, and then putting it back in the heating furnace object teaching prevails, there is found a large abacus which are perfectly trustworthy, even unannealed; as…
Patented · Improved · Wire · Patents · Consists · Scientific American · Machine shop · Linseed oil · Wrought iron · Steam engines · Horse power · Trade catalogs · Cast Iron · Feed water · Iron wire
Internet Archive · Public domain (published before 1931). Free to use for anything.
