as seen in fig1 the smoke removal apparatus , generally depicted by the numeral 10 , is illustrated in use in association with a slot machine 12 of the type normally used in a gambling casino . the slot machine is mounted on a table or cabinet 14 at a level most convenient for a user seated at its front . the slot machine is conventional and because it has no function in the present invention , except to define the environment for he present invention , will not be further detailed . reference , of course , can be made to various publications showing casinos and to the publications of the bally manufacturing co ., the leading maker of slot machines . the apparatus of the present invention 10 is set on the narrow ledge between the slot machine 12 and the side edge of the cabinet 14 so as to be adjacent to the slot machine but not too close as to interfere with the operation of the slot machine , e . g ., the operating handle . the apparatus 10 comprises a chimney assembly set upon a movable base assembly allowing the chimney assembly to be pulled forwardly adjacent the patron , when it is to be used and pushed backwardly out of the way when not in use . as seen in detail in fig2 the base comprises an elongated u - shaped lower channel member 16 , the bottom wall of which is provided with a pair of plates 18 cut there from and bent downwardly at an angle . fixedly mounted to the top of the cabinet 14 are a pair of bent brackets 20 , having an inclined leaf 22 conforming to the downward angle of plate 18 . the brackets 20 are spaced conformingly to the distance between the plates 18 so that on installation , the lower channel 16 may be secured to the brackets 20 by passing suitable bolts or screws through the plates 18 and leafs 22 . in this manner , the lower channel 16 may be removably attached to the cabinet 14 without having to move the slot machine or the cabinet . inserted from the front of the lower channel member 16 is a substantially conforming elongated inverted u - shaped upper channel member 24 having its bottom wall 26 exposed . the lower channel member 16 is provided along each of its side walls , below its top edge with an elongated two way travel slide mechanism 28 , which the upper channel is suspended for conjoint reciprocal movement inwardly and outwardly of both , the front and rear end of the lower channel . the front and rear ends of the slide member 28 are provided with detentes preventing unwanted movement of the slide and upper channel member outwardly of the lower channel member . a two way travel slide mechanism , such as a conventional used for cabinet drawers , and the like may be used . the front end of the upper channel member 24 is provided with a wall 32 which extends upwardly to form a handle 34 by which movement of the channel member 24 is facilitated . mounted adjacent the front wall 32 of the upper channel member is a vertical post 36 . the post 36 is securely fixed to the slide 24 as by welding , so as to have conjoint fixed movement with it . extending laterally from the upper end of the post 36 is a horizontal bracket 38 , from which hangs the smoke removal chimney assembly . the chimney 40 depends downwardly into a position to the side of the slot machine 12 at a level with the head of the user . the entire assembly of base , channel slide , vertical wall and bracket are dimensioned and positioned so that at no time during their movement and / or operating , do they interfere with the slot machine apparatus . the chimney assembly comprises a cylinder 42 , having a chordal opening of about one - half of its circumference ( see fig4 ). the bottom of the cylinder 46 is closed and provided with an ashtray 44 while the top of the cylinder is open and provided with a swivel joint assembly . in detail , as seen in fig5 the swivel joint comprises a ring neck 48 fixedly secured to the open end of the cylinder 42 for conjoint rotation . rotably fit over the neck 48 is a collar 50 which is itself fixedly and staticly attached to the lateral bracket 38 by bolts or screws passing through tabs 52 . the lateral bracket 38 is provided with a cut out opening 54 aligned with the neck 48 and collar 50 to allow free flow of air from the cylinder . the collar 50 is provided with a slot 56 through which passes the shank of a thumb screw 58 which is removably secured in the neck 48 . in this way , the neck and collar are relatively rotable within the range of the slot 56 and may be easily disconnected one from the other by removal of the set screw . the screw 58 also serves as a handle for manually turning the neck and entire chimney cylinder 42 . it will , of course , be appreciated that other forms of swivel joints can be used . as seen in fig3 by swiveling the chimney cylinder 42 , the same apparatus may be employed alternatively or selectively by players facing the same way at adjacent slot machines . when slot machines are arrayed back to back , also as seen in fig3 the smoke removal apparatuses are offset so that the movement of the base assembly of one , in the rearward direction is parallel to , but spaced from the other . in this way , back to back apparatuses will not interfere with each other . turning to fig5 an exhaust fan 60 is located above the cut - out opening 54 formed in bracket 38 . the fan 60 , and if desired , a grid 62 is mounted on the bracket 38 . the fan grid rest upon corner tabs 61 formed at the bottom of the opening 54 and suitable screws , bolts or other fasteners may be used to fix it the fan and grid in place . the fan facilitates the movement of the air through the cylinder 42 , producing a slight under pressure in the chimney cylinders , which acts to grasp the smoke more positively . it may be desirable to mount an extension or the like such as a tubular member 64 on top of the fan and to provide the extension with a curving reduced interior 66 forming a venturi like nozzle to propel the smoke to a height selected to be above the breathing level of most people . in the enlarged , exploded view of fig4 a and 4b , the details of the ashtray 44 is shown as well as its mounting on the cylinder 42 . the bottom wall 46 of the cylinder 42 is in the shape of a horseshoe allowing space for the insertion of the users finger or fingers , while providing a stable shelf on which the ashtray 44 removably sits . the ashtray comprises a semi circular body 68 , having a peripheral wall 70 for holding the ash and waste . the interior of the body 68 is provided with a separating wall 72 to define distinct areas , respectively , one for ash and one for stubbing out cigarettes , the latter being filled with sand or the like . the ashtray 44 is provided with a cover 74 , having a flat rigid bottom 76 on the back 78 of which is hinged a cover flap 80 . the back wall 78 is designed so that when the bottom 76 and cover 80 are placed parallel to each other , the ashtray body 68 fits snugly there between . in this manner , the ashtray can be inserted within the semi cylindrical hood seated properly and stably on the bottom wall , the cover flap 80 being then pivoted to expose the interior of the ashtray for use ( fig4 b ). when the ashtray is full and must be changed , the cover flap is replaced over the top of the body so that the ashtray can be manually removed and replaced with a clean assembly . because the cover flap 80 closes the ashtray , the attendant is protected against burn , and the waste and ash is prevented from falling out . if desired , the bottom 76 of the ashtray assembly may be provided with a magnet 82 cooperating with a ferrous bottom wall of the chimney cylinder for additional security in holding the ashtray . the use of the present apparatus is seen from fig1 . the user , i . e ., casino patron , after seating himself , pulls the apparatus forward by grasping the handle 32 moving the semi cylindrical chimney is located in line with his face , but off to one side so as not to interfere with the slot machine while the user is playing . the chimney is rotated by manipulation of the knurled screw 58 so that the chordal opening is available in a position where the user can easily exhale into the chimney . with the operation of the fan , the smoke will rise rapidly ( see arrow a ) from the hood directly toward the ceiling of the room , thereby maintaining the lower level of the room free of smoke . random smoke from lit cigarettes etc . or ash in the ashtray will also rise as seen by the arrows in fig4 a . the apparatus is provided with several control and safety features which are electrically operated . returning to fig2 electrical power is provided from a conventional line source ( not shown ) through a conduit 90 . the conduit 90 is connected to a normally open ( non - conductive ) microswitch 92 , fixedly located at the front of the base 16 along one side wall . the microswitch 92 defines a female socket member . spaced rearwardly on the same side within the slide 24 , in alignment with the microswitch 92 , is a detent member 94 . the detent is located at a distance equal to the distance the slide member 24 is to be extended forwardly , so that pulling the slide forward for use , the microswitch 92 is closed . opposite to the detent member 94 along the other wall of the slide 24 , is a male plug 96 from which a conduit 98 extends up the post 36 to the fan 60 . at the front end of the base , opposite the microswitch 92 , is a female socket 100 connected by conduit 102 . thus , as the slide 24 comes to its extreme extended position for use , the detent member 94 activates the microswitch 92 while the male plug 96 engages the female socket 100 causing power to flow through to the fan 60 . as a safety measure , the fan should , itself , be provided with an on / off switch of conventional design . further , if desired , a light or lamp 104 can be attached to the post 36 and connected to the conduit 98 so that the lamp 104 will illuminate when the fan 60 is working to indicate to the user that the device is in operation . the front wall 32 of the upper channel is provided with cut - outs , openings etc . to permit the slide to pass over the microswitch when the slide is moved rearwardly . various modifications and changes have been disclosed herein , and others will be apparent to those skilled in this art . therefore , it is to be understood that the present disclosure is by way of illustration and not limiting of the present invention .