I’m sure this picture would be a violation of today’s traffic safety laws. At the very least, I’m sure it would result in a ticket for not wearing a seatbelt. But 85 years ago, it was a different story, and cooking breakfast in a moving trailer wasn’t anything to worry about.

But there was a matter of telling the driver that breakfast was ready, and the intercom shown here would solve that problem. The accompanying article, from the June 1937 issue of Radio Craft points out that there were 250,000 trailers in the country, and it was an untapped market for radio sales. The trailers were practically begging to have a radio installed. It would have to be a heavy-duty unit to survive the vibrations. And equipping it with an intercom would allow the driver of the car to listen to the radio (with the radio mounted away from the ignition system and its possible interference) and also communicate back to the trailer.