King Kong was not only a big ape, but the entire film was a big deal. RKO heavily promoted it and the trade magazines and movie fan magazines were abuzz with as many details as they could get about the production.
The article below featuring a pictorial representation of how they did some of the effects in the movie not only appeared once but twice to two different magazines. The first is in MODERN MECHANIX (April 1933) and the second in SCREEN BOOK (May 1933). They have different titles and page layouts, but essentially the same article
The illustrations are signed by "saunders", the same Norman Saunders who is well-known for his covers and illustrations for many pulp magazines and later for men's adventure magazines. Earlier, his cover art and illustrations like these appeared in many science magazines.
