Parlor problems, or, Mental mathematical magic
A 1920 handbook of mental mathematical magic tricks by Preston Langley Hickey, printed in Minneapolis, Minnesota, by Augsburg Publishing House, and drawn from the Harry Houdini Collection at the Library of Congress. The pictures here are scan-page vignettes: a decorative Eagle Magician masthead with clock faces, a Library of Congress eagle seal with the date 1800, and a Thayer Manufacturing Co. Los Angeles stamp with a bearded face, so they offer a few emblematic devices for a designer rather than instructional diagrams.
