HENRY DRAPER (1837-82) SIGNED SLIP, “Henry Draper”, on a partly printed piece of a document “Signature of the holder” 3.5 x 1.5, by the American doctor and amateur astronomer who was a pioneer of astrophotography. He worked first as a physician at Bellevue Hospital and later as both a professor and dean of medicine at New York University. Draper’s observatory, where he took his much admired photographs of the moon, was located at Hastings-on-Hudson, New York. He directed an exhibition to photograph the 1874 Transit of Venus, and was the first to photograph the Orion Nebula. His wife, a wealthy socialite collaborated with him on his astronomy work. The slip is attached to an acid free backing card and is in fine condition, with one small light stain.