Arithmetic simplified : prepared for the use of primary schools, female seminaries, and high schools : in three parts; adapted to classes of different ages, and of different degrees of advancement
Catharine Esther Beecher's 1833 arithmetic textbook, published in Hartford for primary schools and female seminaries, teaches number through printed lessons. Its pictures are plain line engravings of solid blocks labelled with dimensions of 30 and 2, and a triangle diagram, showing how a cube is built from smaller parts; a designer could borrow the clean, hatched block forms as simple geometric motifs.
