The Automatic Substation from an Economic Standpoint

1920 Scientific American  
Concrete has consistently grown in popularity as a floor material, notwithstanding its tendency to dust and crumble under constant or hard wear. Lapidolith is now widely used to prevent this dust and disintegration, and the only objections to concrete flOors have ' been overcome. TRADE MARK the liquid chemical makes old or new concrete floors " grind proof and dust free , " even under l1eavy trucking. Just flush Lapidolith on your concrete floors as soon as laid, and on your old fl oors which
more » ... ow wear. Lapidolith completes the hydration of the free . lime , thus making · the �oncrete as· SONNEBORN PRODUCTS hard as granite for all time. The 40,000,000 square feet of concrete lapidolized last year alone, stand as conclusive proof in every kind of plant in every part of the country. CEMCOATthe durable mirror-like coating reftects-· all the light. or flat, white and colors. UGNOPHOL-the modern wood pre servative,_ gives _new life to _ olel or new wooden floors.
doi:10.1038/scientificamerican05011920-498 fatcat:zecrqfoh4bfzxdbifib3asplwy