Excerpt from the Foreword:
The majority of the effects described in this book are absolutely new, and require a minimum amount of skill.
I have been using many of them for a considerable time, and they are all original with me, except one. So I sincerely hope that others will not "invent" them in a few months time.
In this publication, Impey describes how to wax together pairs of cards, a technique that Dai Vernon would later refine with rough-and-smooth to create his famous Brainwave deck. Judson Brown is generally credited with inventing the basic brainwave-type effect using Impey's waxed cards...