If used as a blackboard illustration, an eraser will be needed.
"Crayon and Character: Truth Made Clear Through Eye and Ear" by B.J. Griswold
Then one cadet took a blackboard eraser and threw it at the teeth.
"The Mystery at Putnam Hall" by Arthur M. Winfield
The leaders of each file have two balls, bean bags, or blackboard erasers.
"Games for the Playground, Home, School and Gymnasium" by Jessie H. Bancroft
Dick ran along the blackboard, and jerking up one eraser after another he threw them.
"Valley of Wild Horses" by Zane Grey
But when she spoke in her natural voice that look was erased from the features of Mr. Savage as chalk-marks may be erased from a blackboard.
"Nobody" by Louis Joseph Vance
On one wall of the room was a small blackboard, with chalk and an eraser in a box beneath it.
"The Black Star" by Johnston McCulley
This outfit resembled a blackboard eraser and was used in a similar way.
"Paint Technology and Tests" by Henry A. Gardner