MARCONI, Guglielmo (1874-1937). Autograph note signed ("Marconi"), in Italian, to his son Giulio. London, n.d. 1 page, oblong 12mo, on Savoy Hotel notepaper, pinholes upper right corner. Marconi writes to his son Giulio at the Royal Naval Academy in Livorno: "A thousand thanks and embraces." -- OLMSTED, Frederick Law (1822-1903). Autograph letter signed ("Fred. Law Olmsted"), to Mrs. Vincenzo Botta. New York city, n.d. 1 page, 8vo, mounting strip left margin, normal age-toning. "I am truly sorry that I can not accept your invitation to breakfast tomorrow…" -- VON BRAUN, Wernher (1912-1977). Autograph mathematical equation and diagram in pencil on place card. N.p., n.d. 1 page, small 16mo (63 x 89 mm). Formula to determine the velocity of flight necessary to send a vessel to space to float in the Earth's orbit, diagram on verso. [With:] Clipped signature on the back of Frederick S. Blackall Jr.'s business card.

 

Property from the Robert L. McKay Collection, North Tustin, California