Evening Republican, Volume 20, Number 219, Rensselaer, Jasper County, 12 September 1916 — Boon to School Teachers. [ARTICLE]

Boon to School Teachers.

An invention which will be wmcomed by -schoolteachers and othwb who have occasion to use blackboaidta has recently been introduced consisting essentially of a vacuum fan operated by a one-twenty-flfth horsepower electric motor. Not only is the chalk) dust removed by the strong suction of the fan, but the surface of the eraser in cleaned by a rotating bristle brush. The chalk is drawn into a box, from which the air escape through a fin* muslin filter. It is" claimed that n<* chalk escapes into the room. Doctor* claim that a good deal of harm 14 caused to scholars by fce Oust.—;