"Pilots, Man Your Planes!"   
                                         WWII U.S. Naval Aviation Collector's Guide                                                                              
The Aviators' Summer Helmets   
Above:  Retrieved from the National Archives by Dustin are two important documents related to the Summer helmet. First, this Naval Aircraft Factory drawing, dated 2/5/40 and revised 5/22/40. It shows the sizes and part numbers for the three types of  "Helmet, Four Piece"; Leather (intermediate), Summer and Winter Shearling.

Below:  An original blueprint, showing the recommended method for attaching the leather "Mounting Cup" to retain the TH-37 headset and the inner "Ear Pad" (powder puff).

In part two of this article, we will give you a closer look at the distinctive features of each manufacturer's product and explore the myriad of earphone installation methods.