Interesting promotional piece advertising the Capehart company a manufacturer of Public Address systems. The Washington Senators installed a Capehart system in Griffith Stadium in 1930 producing this interesting promotional piece. The large brochure unfolds into a large poster featuring a photograph of Griffith Stadium a 1930 Senators team photo and autographed baseball along with some promotional information about Capehart's PA system. The outside cover is a testimonial letter to Capehard from Clark Griffith. An interesting piece documenting the incorporation of new electronic technologies into baseball stadiums - a precursor to the modern technologies of today.