The cylinder on the top does lend itself to a hotdog or a very long hamburger. The bun warmer may be your own buns. I doubt Riders has the schematic. I did find an Oscar Mayer listing but I have to check that.
If you are not among the landed and cannot afford a Sandwich Machine or do not have 1200amp service at your house, you boiled hotdog fans huddled over your tin pot of hot water can gaze at the wonder of this later invention of the ages. Skip the dangerous campfire flames and save Southern Cal. No more RFing yourself to a cinder. No microwaves sparking the foil you forgot to take out of the microwave. No swooning for Howard Johnson's split-and-grilled hotdogs. The brute force dog cooker arrives in the modern kitchen of 1965! A baloney tube tribute to early television HV. Better living through amperage.
No campfires to suffocate you. No dangerous waves of death cooking the cat sleeping nearby. No military radar waveguides needed. Just electrocute your dog at 120v through the modern dog cooker and the wonders of salinity.
http://www.youtube.com/watch?v=St2USEfQxZU
And I do have one of these capital punishment dog cookers. Westinghouse I think from the 60's. The lid is the interlock like the vid. 120v on the lid and the circuit completes when it is lowered to the dog tines...in parallel for a Super Bowl party. It does cook in about 3 minutes and the dog comes out looking most unappetizing. Warped, bloated, discolored, hot and a burned spot worthy of a Texas penal institution.
And I have seen a lunch counter version of this from the 40's (and he will not sell it to me). It was a stand-up version about 2'x3' with the tines poking out and no cover. Dogs killed in the open. Great artwork on the porcelain face. Stab on a dog, flip the switch and watch your dog go to it's great reward right there on the counter in front of the happy clown face artwork. Sure to impress 10 year old kids and keep them in therapy forever.