When dryers say that they are for operation on 120-240 volts, it usually means that there are components of the machine that operate on 120, like the motor, timer motor, lights etc and there is the heating element which operates on 240. Moving the wires of the 120 volt cord between one of the two hot sides and the neutral middle connector will enable most to operate on a strong 120 volt single appliance circuit.
There should be a pullout filter attached to an almost rectangular discharge duct on the front of the dryer. Hamilton dryers used the "Carrier Current" to move steam out of the dryer. A fan drew air into the dryer at the base. A small amount of that air was carried up and over the heating element to enter the drying chamber. Most of the air flowed in such a way that it pulled the steamy air out of the bottom of the drying chamber. Ross Moore, the inventor of the dryer discovered that the rotation of the drum and the tumbling clothes brought the humid air to the bottom of the machine because the hot air in the top of the dryer was cooled and became heavier when it absorbed the moisture, so it fell down to the area where the the moving stream of room air sucked it away. All except the first Hamilton dryers could be vented by putting a baffle in place between the filter and the discharge duct. This directed the air to the rear of the machine where it could be vented through a 3 inch pipe. Higher air flow dryers used 4 inch vent pipe. The first Hamilton Gas dryers had two vents. One was for the air flow of the drying laundry. The other was a little vent through the top rear of the dryer with a little pointed cap chimney. This dryer did not have the products of combustion flow through the dryer like most gas dryers. Rather, it heated a glow plate in the upper part of the outer drum that radiated heat into the dryer much like an electric element would, but not as well.
