Hammond, John H. Unknown - 1995
John H. Hammond was a writer and historian on Camera Obscura and Camera Lucida. His book “The Camera Obscura: A Chronicle” was published in 1981. He presented much of his background research material for this book to the Science Museum in October 1981. In August 1983 and November 1987 he further presented research material on the Camera Lucida to the Museum, his second book “The Camera Lucida in Art and Science”, co-written with Jill Austin, published in 1987. Hammond died in 1995, bequeathing to the Science Museum further research on the camera obscura and camera lucida as well as material he had gathered for a third book “Mechanical Aids for Drawing”, which remained uncompleted at his time of death.