122 i^ATURAL SLATE BLACKB0Atli)S5. The most substantial and durable Blackboards in existence. The most perfect in quality, color, and finish. … The fine apijearunce ol a schoolroom when liuished wiih Heal Slate Blackboards is shown in the above cut. Real Stone Slate Blackboards. Why not have Blackboards made so they will last as long as the building stands, and never need repair? Why continue to use preparations of plastering, putty, and…
Schools -- Furniture, equipment, etc. · Teaching Aids and devices
Internet Archive · Winterthur Museum Library · Public domain (published before 1931). Free to use for anything.