cast iron, thick. On the side there is a big nut that could be unscrewed but it would be an awefully big hole for just air to come out. It is definitely not a valve though.
the rads are just below waist in height with only a lever to turn on or off on the radiator. I didnt notice any cap. The house was built in 1935 so I assume thats when the rads were put there as well....
Firstly, I am a first time home owner so I don't know too much yet about home improvement. My problem is that I have a large hot water radiator in my living room with about 25 rungs. However, only the first 9 rungs heat up. So I figured maybe I have a ton of air. So as I looked for the bleeder...