referring fig1 and 2 of the drawings , the illustrative popping apparatus includes a generally cubic cabinet 10 to a top edge of which is attached a tiltable lid 12 penetrated by the bottom portion of a sizeable corn popping kettle 14 . a bracket 16 is mounted on the cabinet and supports a large holding vessel 18 proximate the front wall of the cabinet . two sets of ground engaging wheels 20 and 22 are attached to the bottom of the cabinet 10 to facilitate movement of the apparatus from place to place . a fuel burner 24 is housed within the cabinet below the kettle 14 for heating corn kernels to popping temperature . the cabinet 10 includes an open , box - like structure made up of upright , generally square metal frames 26 and 28 which provide the right hand side and left hand side , respective , of the cabinet as viewed in fig2 and similar frames 30 and 32 which provide the front side and rear side , respectively , as viewed in fig1 . preferably , the frames 26 , 28 , 30 , 32 are fabricated by welding together tubular steel members having a square cross section . for example , and as best shown in fig1 the top and bottom horizontal members 26a , 26b , respectively , of side frame 26 are welded to the front and rear vertical members 26c , 26d of this frame . the other cabinet frames referred to hereinafter are similar in structure ; and , the method of assembling the basic cabinet framework will be obvious to those acquainted with metal fabrication . each of the upright frames 26 , 28 , 30 , 32 is covered by a steel sheet or panel welded to the vertical and horizontal tubular members defining each frame . fig1 shows the right hand panel 34 , fig5 depicts a major fragment of the left hand panel 36 , and fig3 and 4 show small fragments of the front panel 38 . the rear frame 32 is covered by a similar panel , not shown , to complete the vertical enclosure of the space inside cabinet 10 . the bottom of the cabinet is open to admit combustion air to the fuel burner 24 . the joined upper members of side frames 26 , 28 , 30 , 32 , of which members 26a , 28a , and 30a are shown in the drawings , define a top marginal frame for the cabinet 10 . to the undersides of these marginal members is attached a transverse top panel 40 similar to vertical sidewall panels covering the sides of the cabinet . the lid 12 includes a frame 42 corresponding in size and shape to the aforedescribed frame defining the top of the cabinet ; and , frame 42 is made up of side members 42a , 42b and front and rear members 42c , 42d . overlying and attached to the upper surfaces of members 42a , 42b , 42c , 42d is a transverse lid panel 44 having a central aperture 46 through which extends the bottom portion of kettle 14 . the kettle 14 and lid panel are welded together or otherwise attached at their circular line of contact so that the kettle may be tilted with the lid 12 and dumped in a manner to be described . the lid 12 is pivotally hinged to the cabinet 10 for upward tilting movement about an axis extending longitudinally through the front top frame member 42c . fig3 shows one of two like metal strap hinges 48 which surround pivot member 42c and are fixed to the underlying front frame member 30a . the looped bodies 48a of the hinges are axially penetrated by member 42c ; and , the spaced legs 48b of the hinges are welded to opposed surfaces of member 30a . the lid panel 44 is notched as shown at numeral 50 in fig2 and 3 to permit pivotal movement of the lid panel 44 relative to the fixed strap hinges 48 . in fig1 the lid 12 and kettle 14 are depicted in their lowered or popping position relative to the cabinet 10 ; and , in fig2 the lowered or popping position is shown in phantom lines while the tilted or dumping position is shown in full lines . to manipulate the lid and kettle about pivot member 42c to dump or to lower the same , the preparer may grasp a c - shaped handle 52 attached to the rearward portion of the top surface of lid panel 44 . to limit the forward pivotal movement of the lid 12 to the desired stop position shown in fig1 a metallic lug 54 is welded to the upper surface of lid frame member 42c and projects through a slot 56 relieved medially in the forward margin of lid panel 44 . as best illustrated in fig4 forward tilting of lid 12 and kettle 14 is arrested by abutment of the stop lug 54 against the front cabinet frame member 30a . in this arrested position , the lower portion of kettle rim 14a is disposed over and within the open top of the vessel 18 thereby assuring that the kettle contents will be directed into vessel without spillage . as best seen in fig1 a conventional propane gas burner 24 is mounted on a bracket 58 which extends upwardly from the center of an underlying crossmember 60 attached at its opposite ends to cabinet frame members 26b and 28b . a suitable burner control assembly 62 including a conventional gas supply valve and pilot light is mounted on the rear cabinet panel and is connected in line with the burner 24 and a propane tank , not shown . an essential feature of this invention is the provision of a central aperture 66 in the top wall panel 40 of the cabinet 10 which has a diameter selected to permit the kettle &# 39 ; s bottom portion 14b just to pass through panel 40 while depending downwardly into the cabinet interior in close proximity with the burner 24 when lid frame 42 is lowered to rest on the cabinet top frame . by mounting the kettle so that its bottom 14b projects through the lid panel 44 and by additionally providing the cabinet 10 with a top wall panel 40 having an aperture that can be effectively blocked by the kettle bottom , the emission of hot gases upwardly from the cabinet top during the popping operation is substantially reduced , if not altogether eliminated . not only do the lid panel 44 and the top wall cabinet panel 40 coact to provide a double barrier to direct discharge of hot gas from the cabinet top , but an essentially closed , flat chamber 68 is defined between these panels when the kettle is lowered for popping . the vertical extent of chamber 68 is shown in fig3 ; and , from fig2 it will be understood that a wall segment of kettle 14 defines the inner wall of this chamber while the cabinet top frame and the lid frame abut one another to form an essentially square outer wall for chamber 68 . an unexpected benefit derived from the provision of chamber 68 is that this air - filled space functions as a thermal insulating barrier which somewhat reduces unwanted convective heating of the lid 42 , the handle 52 , the kettle segment extending upwardly through the lid panel 44 , as well as the open space immediately above the cabinet . when the lid 12 is tipped to dump popped corn into vessel 18 , the control 62 may be operated to reduce the heat output of the burner 24 . in any event , when the central aperture 66 through the top panel 40 is open , the remainder of panel 40 partially abets the rush of hot gas from the open cabinet top . it is intended that the cabinet interior be vented at all times by means of suitable openings through one or more of the aforedescribed upright cabinet wall panels . for example , fig1 shows that an upper corner of panel 34 has been removed and a protective screen put in place over the triangular opening ; and , fig5 depicts an array of circular openings 72 through wall panel 36 . in accordance with one object of this invention , a substantial degree of mobility is afforded the relatively heavy and bulky corn popping apparatus by means of rear and front wheels 20 , 22 . the rear wheels 20 are conventionally mounted on a rear axle 74 attached between the cabinet side frame bottom members 26b , 28b whereby the wheels 20 project downwardly through and beyond the bottom of the cabinet 10 , as shown in fig1 . the side frame bottom members 26b , 28b project forwardly considerably beyond the cabinet side frame upright members 26c , 28c , respectively , as shown in fig1 and 5 . a front axle 76 which carries the front wheels 22 is mounted on an oscillating frame 78 comprising spaced legs 80 which are connected by a cross member 82 and by the axle 76 . attached proximate the ends of the legs opposite the cross - member 82 are apertured blocks 84 which receive and retain the opposite ends of the axle 76 . as shown in fig2 and 6 , the frame 78 is rotatably attached between the cabinet side frame bottom members 26b , 28b by pins 86 extending laterally through the legs 80 . in the wheel - lifting position of the frame 78 , shown in full lines in fig1 and also shown in fig6 the blocks 84 project upwardly from the frame legs 80 thereby raising the axle sufficiently to support the wheels 22 out of engagement with any underlying surface upon which the rear cabinet wheels 20 rest . with wheels 22 so raised , the front end of the members 26b , 28b will be tilted downwardly slightly by the cabinet &# 39 ; s weight into stabilizing engagement with the surface underlying the cabinet . to lower the wheels 22 for ground engagement , members 26b , 28b are lifted so that frame 78 can be rotated or pivoted counterclockwise , as viewed in fig1 through 180 degrees to place the wheels in the lowered condition depicted by phantom lines . in this position of the frame 78 , the ends of the legs 80 opposite the wheels 22 will bear against a pair of stop tabs 88 which limit counterclockwise frame rotation . the tabs are located and fixed to the underside of members 26b , 28b so that they do not interfere with subsequent reverse rotation of legs 80 . to raise the wheels 22 , the members 26b , 28b are lifted to permit clockwise rotation of frame 78 and the wheels to the position shown in full lines in fig1 and 5 wherein the members 26b , 28b will again rest on an underlying surface . in accordance with this invention , the large , pot - like vessel 18 has a volumetric capacity great enough for holding several batches of popped corn dumped thereinto from the popping kettle 14 . the vessel is preferably fabricated from a malleable metal such as copper and its size gives it substantial weight the vessel 18 is mounted directly upon cabinet 10 to provide the advantages of easy transportation of the vessel with the wheeled cabinet , stable support of the curved - bottom vessel off the ground , and vertical support for the vessel at an elevated height whereby manual scooping of popped corn from the vessel for bagging becomes more convenient and less tiresome . to this end , vessel 18 is suspended by a circular collar or bracket 16 which underlies and engages the vessel rim 90 . fig8 shows that the rim 90 is somewhat enlarged and has been shaped to project radially outwardly from the vessel wall 92 . the bracket 16 is rectangular in cross section and is thin enough to permit the bracket to underly the rim 90 and to flex somewhat to conform to any irregularities in the vessel wall . as shown in fig2 angularly opposed portions of the bracket 16 are connected to tubular receivers 94 . the forward projection ends 94a of the elongated hollow receivers 94 are appropriately shaped to conform to the vertical wall of the bracket thereby facilitating attachment of the receivers to the bracket by welding or a similar process . as best illustrated in fig7 an elongated cylindrical shaft 96 is rigidly fixed to the upright right side frame member 26c . an identical shaft , not shown , is similarly attached to the upright left side frame member 28c . the shafts 96 project in a cantilevered fashion forwardly from the members 26c and 28c and closely fit with the interior cylindrical wall 94b of the receivers 94 . when shafts 96 are fully inserted into the receivers , the extreme rear end surfaces of the receivers abut the members 26c and 28c and the distal ends 96a of the shafts are situated proximate the points of attachment of the receiver ends 94a to the bracket 16 . such substantial telescopic engagement of the shafts 96 and receivers 94 rigidly supports the bracket 16 in vertically spaced relation with the underlying wheel - mounting frame 78 . while ruggedly constructed receivers 94 and shafts 96 coact to support the substantial weight of the vessel 18 , it will be understood that the bracket 16 can be readily removed from the cabinet 10 , with or without the vessel in place , by sliding the receivers horizontally forwardly from the shafts . the ease of assembly and disassembly of the bracket 16 from the cabinet 10 facilitates removal of the vessel as desired for cleaning , transporting and storing the same . to enable an operator of the hereindisclosed corn popping apparatus to tilt the kettle 14 for rapidly emptying its contents into vessel 18 thereby reducing the time that hot gas or flame may escape through the top panel opening 46 and , accordingly , reducing the exposure of the operator and customers near the apparatus to injury or discomfort , a counterbalancing device , indicated in its entirety by numeral 98 , is attached between the cabinet side frame member 28b and the lid member 42c which , as noted above , pivots within the hinges 48 as the lid is raised and lowered . the device 98 includes a short rod 100 having a threaded end 102 extending through the opening of a nut 104 that is rigidly fixed to the laterally projecting extension 106 of the lid member 42c . the opposite end 108 of rod 100 is transversely penetrated by a pin 110 which , in turn , penetrates the spaced arms of a clevis 112 . a rod 114 rigidly attached to the clevis at its upper end 116 has its lower end 118 threaded through a nut 120 fixed to the upper end coil of an elongated tension spring 122 . the opposed end coil of this spring is anchored to a tab 124 extending outwardly from the left side frame bottom member 28b . the purpose of the spring 122 is to exert tension through the rod 114 and clevis 112 upon the forward end 108 of the rod 100 . this tensile force acting on rod 100 creates a moment about the longitudinal axis of the lid pivot member 42c which counterbalances a substantial part of countervailing clockwise moment created by the combined weight of the lid 12 and the kettle 14 . this counterbalancing effect can be adjusted to minimize operator effort required to tilt the lid for dumping while still permitting the lid to reseat completely upon the cabinet top frame when it is lowered . such adjustment is achieved by changing the length of the forwardly projecting end 108 of the rod 100 and / or by changing the extent to which the 114 is threaded through the nut 120 whereby the spring tension is varied accordingly . the foregoing description of the embodiment of the invention shown in the drawings is illustrative and explanatory only ; and , various changes in the size , shape and materials , as well as in specific details of the illustrated construction , may be made without departing from the scope of the invention . therefore , i do not intend to be limited to the structure shown and described herein , but intend to cover all changes , modifications and substructures which are encompassed by the scope and spirit of the appended claims .