Original old business trade magazine vintage ad for FELT AND TARRANT MANUFACTURING COMPANY of Chicago, IL.  Out, Damned Spot, Out!  When the sun breaks out with a rash of spots, beware.  Take a long hard look at the remarkable economy of Comptometer adding-calculating machines. Photograph of sunspots courtesy the Cook Observatory of the University of Pennsylvania. This 1947 office equipment magazine advertisement would display beautifully matted and framed.