JOHN J. AUDUBON
Title: Purple Martin. No.#9 PI.45 Octavio Birds
Medium: Hand colored Lithographs. Printed & colored by J.T. Bowen, Philadelphia, c.1836 & 1844
Original first edition of the Royal Octavo Birds of America. Published in Philadelphia and New York by John James Audobon. Lithographed by John Bowen of Philadelphia.
Octavo originals were reductions of Audubon's larger engravings, this being accomplished through the camera lucida process, which through the use of a prism, allowed Bowen to project a reverse image of the original print in reduced size onto the smaller stone.