operated at a low level of energy input for a major portion of a drying cycle followed by a high energy input for a short period near the end of the drying cycle a single heater provides both levels of energy input and has associated control means to operate the heater at the different input levels for example an electric heater element is controlled by cam actuated switches to operate at two levels of voltage input or a gas burner is provided with two solenoid actuated valves which are also controlled by cam actuated switches to operate the burner at two different levels of fuel input application_number US 2107979 A description an automatic clothes drying appliance is shown generally at 10 in fig1 the dryer 10 has a cabinet 11 having a hinged door 12 opening on a front thereof the dryer 10 has a control panel 13 having a control dial 15 which is user operable to selectively set a control device 14 for various drying cycles of operation as for example a timed drying cycle a flange 20 in the front of the cabinet 11 defines a receptacle opening 21 through which clothes may be deposited in a rotatable drum 22 the drum has radially inwardly extending vanes 25 mounted on an interior surface thereof and is rotated by a suitable drive means 23 a rear wall 29 of the dryer against which drum 22 rides in air sealing relationship has an air inlet 26 and an air outlet 28 therein a perforated wall 26a extends vertically within inlet 26 and is.