Here is the first magazine cover that I know of with Palomar on it. It is from years ago, the December 1936 issue of The Sky (before the merger to form Sky & Telescope).
On the cover is a celluloid model of the 200-inch telescope that was used by Westinghouse to help model the stresses and strains of the design.
The model was later on display for the "last bolt" ceremony held at Westinghouse on April 30, 1937. Look for it in the photo below on the reviewing stand Attending the ceremonies were Caltech president Robert Milliken and Albert Einstein.
I hope that nobody minds that I squeezed in two pics for this Palomar History Photo of the Week.