Years ago I worked for Marsh Farms in Garden Grove, California where I grew up. Those old Marsh Turn-x still air incubators worked very well. I notice that the one in the photo has a clear or white lite bulb, if one wants to use the incubator, I'd highly recommend obtaining a 40 watt green or blue bulb as the clear can blind chicks. I would love to have one of those old still airs though some parts are hard to obtain now. We sold many of those incubators to schools and folks who just wanted to hatch eggs for their own use. I even helped build those incubators. Mr. Marsh was very ingenious and the original still air Marsh Turn-X incubators were made from clear cover cake plates! When Marsh could no longer obtain those, he then designed his own cover and plates which are what is used on the incubators being manufactured now. Marsh also designed an automatic turner for the Turn-X incubators.
In looking through the replies, I realized that I had posted a reply to this a while back. Hope that the incubator worked out ok. Getting to that age where not all things yours truly does are remembered LOL!