SAMUEL PIERPONT LANGLEY (1834-1906) SIGNED CARD, “Autograph of S. P. Langley”, on a card 4.25 x 1, by the American astronomer, physicist, inventor, and aviation pioneer. He was Secretary of the Smithsonian Institution, where he founded the Astrophysical Observatory; professor of astronomy at the University of Pittsburg; and director of the Allegheny Observatory. He invented the bolometer which was first used to make the first calculations on the greenhouse effect. He also attempted to make a working piloted heavier-than-air aircraft. His models flew, but his two attempts at piloted flight were not successful. The boldly signed card is in fine condition, with minor age toning.