Chalkboard eraser

Chalkboard erasers are typically broad and rectangular, intended to clear large areas for new content as part of a lecture or presentation.

Chalkboard erasers were invented around 1863 by John L. Hammett,[3] who owned some stores that sold and created school products in Rhode Island and then later in Boston.

At the time, rags or old cloths were used to erase and get rid of the chalk markings on slates in schools, offices, and for the most part, everywhere.

Hammett then, during a presentation on his chalkboard "discovered" that wool felt strips wiped off the chalk writing better than rags.

The erasers proved to be a success for Hammett and, later in the 19th century, he created a company that also sold inexpensive supplies for teachers and schools, such as paper and ink.

Chalkboard eraser