Technology

=Technology: 1776-1860=

The abacus, or counting frame, was used in schools in the nineteenth century. This early calculator was made of a wood frame with parallel wire rods, each with wooden disks that glided on the rods. Teachers would hold up the abacus to demonstrate and test students' computational skills. Usually there was only one abacus in the classroom.

The stereoscope was introduced in the 1870s. It was first used as parlor entertainment, as the hand-held viewing instrument created three-dimensional images of landscapes, plants and animals. These made their way into the classroom as an observation tool.