William M. Rittase (1894-1968) was a commercial photographer based in Philadelphia, Pennsylvania. He worked for Fortune magazine and the advertising firm N.W. Ayer's of Philadelphia. He was nationally and internationally known for his work during his lifetime. This small collection comprises a series of six images that showcase the autogyro Pitcairn PCA-2 in flight, on a flight field, and its interior. These specific images are of aircraft serial number NC11610, purchased by the U.S. Department of Agriculture, Bureau of Entomology.