Description: Refinishing blackboards at Horace Mann School, Jan. 15, 1948. Jack Spence is seen demonstrating a specialized piece of equipment used to clean the surface of classroom blackboards. The machine rotates a disk against the blackboard and collects the dust by use of a vacuum. The blackboard is actually resurfaced, being ground below the level of any nicks that have been made in the sometimes 50 year old blackboards. Paul Granlund, principal at Mann School, and teachers Margaret Wheeler and Mabel Lyon look on at the amazing machine. Photo taken for Mr. Kimball, Tacoma School Board. (T.Times, 1/22/1948, p.7; TNT, 1/22/1948, p.12)
Posted on: Thu, 23 Oct 2014 07:35:38 +0000