I think that's a foam generator (hi-ex?), from the days before pre-piped systems were common.
Quote:What is the round thing on the back of Glendale's Seagrave Engine? Looks to be either a vent fan or a foam fan.
John I.
Fire/EMS Dispatcher / EMT-B
Fire Apparatus Photographer / Hobbyist
www.fireapparatusphotos.com
www.flickr.com/image7801
Nikon D5600 (retired: Nikon D90) / Nikkor 18-55mm f3.5-5.6 / Nikkor 35mm f/1.8
Fire/EMS Dispatcher / EMT-B
Fire Apparatus Photographer / Hobbyist
www.fireapparatusphotos.com
www.flickr.com/image7801
Nikon D5600 (retired: Nikon D90) / Nikkor 18-55mm f3.5-5.6 / Nikkor 35mm f/1.8