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Sept. 24,1946. " ~ ' _ R, J_ STEWART I _ - ~ 2,408,107 APPARATUS FORMIXING AND FILLING BEVERAGES‘ \__7 -_ Filed Feb.‘ 14, 1940 L - 3 Sheets-Sheet 1 v _ ' Sept. 24, -l946.' R. J. STEWART- 240-8307 APPARATUS FOR MIXING AND FIELLING‘BEVERAGES Filed Feb.’ 14,' 1940 31Sheets-She‘et' 2 W=WW ch62,“ ' . l Sept. 24, 1946. ’ ‘ ' > J, STEWART 7 2,408,107 APPARATUS FOR MIXING AND FILLING BEVERAGES , Filed, Feb. 141 1940 s sheets-sways 2,408,107 Patented Sept. 24, “1946 ‘UNITED STATES PATENT OFFICE 2,408,107 APPARATUS FOR MIXING AND FILLING BEVERAGES Robert J. Stewart, Baltimore, Md., assignor to Crown Cork & Seal Company, Inc., Baltimore, Md., a corporation of New York ‘Application February 14, 1940, Serial No. 318,964 8 Claims. (Cl. 259-8) 2 1 The present invention relates to apparatus for mixing and ?lling beverages. ‘ In the production of beveragessuch as, soft‘. drinks, consisting of carbonated water and syrup, it has‘ been .usual to separately ?ow syrup and carbonated water into a bottle or other container and then bodily move the container in some manner, either by hand or by machine, to. cause provision of a method and apparatus of the type referred to above which isv readily adapted to handle various mixtures without the necessity of flushing a large number of the elements of the apparatus. ' > I A further object of the invention is the pro ' vision of an apparatus and method for mixing liquids under varying pressures while maintain ing the proper proportion of each liquid. Other objects and advantages of the invention subsequent bodily movement of the container has 10 will be apparent from the following speci?cation been nec'essary'to obtain mixing because of the and drawings, wherein: factthat- the body of heavier syrup tends to re Figure lis a diagrammatic view of the appa main at the bottom of the bottle. ' ratus of the present invention. ‘ In order to avoid the necessity of the mixing Figure 2 is a view diagrammatically showing step discussed above, as well as the labor and 15 the two liquids‘to be properly mixed. - Such apparatus required thereby, various methods‘ of , the wiring system used in the apparatus of Fig mixing'the two liquids prior to the flowing of ure 1. ‘ . Figure 3 is a detail section on the line 3-3 of Figure 1. . It has been iound'that by mixing the syrup and water prior to flowing into a container, the 20. Figure 4 is a vertical sectional view through a the same into a bottle have been proposed. ?lling can be accomplishedmore quietly since the possibilities of foaming during ?lling are mixingdevice included in the present invention. reduced and a more uniform proportion of syrup line 5-5 of Figure 4. Figure 5 is a horizontal sectional view on the - Figure 6 is a vertical sectional view through a 'By‘one such process, syrup and plain water 25 settling tank included in the invention. Figure 7 is a top view of a gas trap included in have been mixed and then carbonated together. and water is obtained. ' ' into contact with the interior of the carbonator the present invention. Figure 8 is a side elevation, partly in section, as well as' a substantial extent of the piping in of the gas trap of Figure 7, and Such an arrangement causes the syrup to come cluded in the mixing apparatus.‘ Bottling con 30 cerns ordinarily handle several soft drinks, each ~ , Figure 9 is a side elevation of a second form of gas trap. ' ' - Referring to Figure 1, the numeral l??desig including a different syrup. Obviously, it is de nates a carbonator for carbonating water deliv sirable to keep the amount of surface or piping ered thereto through the line H from a pump, l2 with which the syrup comes in'contact at a minimum, since all such surface must be washed 35 operated by, a motor I3. The carbonator I0 is of any well-known form including a liquid level or ?ushed before the apparatus can be used T 4 control'_for the motor I3, and the water‘ carbon ated thereby will flow from the same through Another objection to prior methods for mix the pipe M to a gastrap 1-5, hereinafter de mg carbonated beverages is that they have too‘, greatly agitated the mixture. One particular 40 scribed in detail, and thence to a water pump l6. cause‘of agitation has been the manner in which Water pump I 6 is driven by a shaft 1 driven through a belt l8 by a variable speed transmis the ratios‘of the two liquids have been maintained. An important object of the present invention sion device l9, hereinafter fully described, is to provide an improved method of ?lling liq The speed transmission device I9 is driven 45 through a belt 20 from the shaft 2| of gear re ‘ Anotherlimp'ortant object of the present inven duction unit 22 which is in turn driven through a belt 23 by a motor 24. v ' tion' is to provide a method and apparatus where-. to handle a different soft drink. uids. ' ’ " ' i by liquids may be mixed and ?lled without undue _ agitation thereof. ‘ f Another object of the invention is to provide 'a method and apparatus for mixing liquids which are so designed that the proper ratios of the liquids comprising the mixture will be accurately " The driven vshaft 2l of the gear reduction unit 22 extends to a pump 26 to which the syrup sup ply line 21. is connected through a gas trap 28. Water ?ows from the water pump l6 through a line 30 to a water meter 3! and syrup ?ows from'the syrup pump 26 through a line 32. to a syrup meter 33. The two meters 3| and 33 may . f c I .. . ,Still another object of the invention is the 55 be of any well-'knownltype, for’exaniple ofv the maintained» 2,408,107 4 3 construction disclosed in Hosmer Blum Patents a tube ‘5| of small bore which extends down Nos. 1,423,597, issued July 25, 1922, and. 1,977,424, wardly through the center of tube 50. Thus the water and the syrup will enter the mixing device issued October 16, 1934. However, each meter 47 from the same direction and in generally con centric streams. The ?tting or tube 50 is formed should be of such type that it will accurately measure a liquid, regardless of changes in the C11 in the top wall 53 of a cylindrical chamber 54, the body of' which is preferably'of glass. A ro tating cylindrical e1ement'55 of substantially less delivery pressure of the liquid. The shafts’ 314‘ and 351 of meters 3| and 33} which are driven by the meters toregister or in dicate the flow of liquid therethrough are ex tended from the respective meters and, as shown in detail in Figure 3, the shaft 34 of one of the meters, in the present instance, the water meter 3|, carries a slip clutch 36 through which it is connected to a splined shaft 3-1. The shaftf?i of the other meter carries a slip clutch=38~through1 which it drives a threaded shaft 38 which extends co-axially with the shaft 31,, the adjacent, ends length than the chamber 54 is ?xed upon a shaft 55~‘-extending down through the lower wall of the chamber. Element '55 is of such diameter that a relatively small space will be left between its periphery and the inner surface of chamber 54 andtheouter surfaces of the cylinder are smooth 3 was to/min'imiza agitation. Exteriorly of the chamber'E'Ir shaft56‘ is provided with a pulley 5'! driven through‘ a» belt'58 by a motor 59. of shafts 37 and 39 being substantially in abut The lower wall 60 of chamber 54 includes an ting relation. A collar or traveling nut “bridges extension 6! surrounding the shaft 56 and the two abutting shafts,.the end portion of nut 20 through which the mixed liquid will flow to a line 62. extendingtoa settling tank 6-3. . 41!; which engages splined; shaft. 3.‘! being keyed‘v and. they other. end portion of the nut‘ being The rotary element;55.:within the. mixing device cylinder 54 is rotated‘ at a. relatively-‘high. speed t'hr-ead'edlto engageshaft .39.. ' Collar. 49'. isengagedby ayoke flit carriedby a. in order. that the incoming syrup andwaterwill lever 42 extending to the speed changezdevice l9 25 be. thoroughly mixed. However;. since.v the. ele ment 551s perfectly. smooth, its rotation will not; and pivoted intermediate. its ends as indicated cause‘. releasezofigas in the carbonated water be. art-d3; At itsefari end the lever 42; engages‘. the operating handle 4%. of. the speed: change. device. ingmixed. That is‘, the, syrup andwater‘enter ing: the chamber 54 in a generally concentric; By this arrangement, if o-neof shafts 37s’. and 35 stream. will. move down; upon. the. upper. surface is driven by. its- meter. to. rotate at‘. atdiiferent of the drum 55 rotating in; the. same: direction. Speed from the othervrthe traveling-unit: 4.5L will as the liquids. are. swirling. Howeverbsincethe' move in a direction further. along the faster ro drum 55 is rotatingat amorerapidspeeditiwill tating. shaft, thereby shifting. lever 4-2 with. a cause‘. the relatively thin body of liquid: between resulting actuationofi' the operatinghandle 4140f speed-change device 191;. During such movement 35 'I its upper‘ surface. and‘; the undersurface. of the the clutches-Strand 38 will notsl-ip, but only-upon extreme movement of the nut as hereinafter- described. ' The speed change device l9 may be. of any’ well}. known» type whereby gradual changes‘ of speed-1 can:e be obtained. However, in'thepresent embodiment it is: of. a type including a driving and a driven pulley connected byabelt; one pul Icy. comprising-v facing convex: discs urgedi to gether on- their'common shaftlby a~coi1 spring. Whenthe- distance offeither pulley axisfromr the other is varied, the belt connecting the two~pulleys will be caused to ‘engage a different diameter of the tapered faces-of the multidisc pulley'with tharesultwthat a change‘ in speed of. the driven 50 pulley will be obtained. top wal1..53 of thechamber'to swirlwithafaster motionso that the two;liq.uids2'will. be furtherin termingled. Then,.. when the. liquids. move; down between thearelatively narrow space between the side surface of the rotating._drum>55: andthe in ner. wallof the. chamber: 58,. they will. be com pletely mixed due. to'ithei opposing. frictional ac tion exertediby. the stationary chamber’ wall. and that of the rotating drum, It is desirable: to provide a. check valve.“ in the syrup inlet tube-5|. so that shouldthe sup-' ply of syrup fail for'anyreason, water will not. enter the. syrup line. 481v Check1valve64- is so. mountedland controlled thatit will notinterfere with. the. ?ow. of syrup. under‘ pressure past the: same. The. settling; chamber: 63;. is. illustrated in' de tail. in Figure 6' and is. of. cylindricallform, the. syrup and‘ water line 62 opening. to. the. lower l Itwillbeobvious from the above that the speed change‘ device" IE‘ will. thus control. the. speed of.‘ operation of. the water. pump. E61. $0 as-tohold the supply of'water ?owing fromthe water-‘meter 55 wall 61: of. the: device; to a pipe?ilzrwhichextends. a substantial. distance" up into the. chamber;. A 3511 at the proper proportion? with respect to the. float 69 is pivotedin; the chamberJE3 in such .po-: supply: of: syrup leaving thexsyrupmeter 33-; In: sition that. the level of the- liquid within the set mostisoft drinks; oneipart ofsyrup. is mixed with. tling: chamber will normally be above theqinleti. ?ve: partsofrwater, but‘ the arrangement provided hereinimayxbe varied:to maintaimwhatever ratio 69 extension 68 but will also be a substantial dis.-v tancewbelow the upper end of the: cylinder. p" is desired. - The outletiiof' the; water meter 3| is connected. ' Chamber 63*is provided with. anzoutlet 19 in its; lower. wall.“ from: which. a line‘ ‘H extends to by a pipesll‘?zt0therinlet 45": of. the mixing device the-reservoir. 12. of: the. ?lling'ma'chin'e T3. The: Q7: and the outlet’ ofv thesyrup meter 33 is con nected by a line 43: to. a second. inlet 49.‘ of't'h'e; 65 float 69 is connected exteriorly of the settling‘ mixingidevice. chamber. 63: withiia switch, preferably ‘a mercury typeswitch, Withina? casing 15, thepurpose‘of‘ Referring to Figure 4, which. illustrates‘ the switch15 being to control the'main driving motor mixingdevice 47in detail, it will be. noted that 24 so that should the level of the liquid: in cham thewater: inlet Minis. of relatively large'diameter and; as best shown‘ in Figure 5, is arranged m berr63 rise to an extreme extent, the motor 24 will;.be stopped. The ?oat. rodéis' also connected eccentrically-with respect. to a vertical tube. por within casing 15 to. a valve. mechanism, not tion 5trof theinlet, with the result that the water shown, connected‘ to a pressureiv?uid line~l6 to willhave- a‘ swirlingrmotion: as‘ it moves down control flow through lines 16a and 76b‘ toaa..presthrough tube portion 50. Thesyrup line 48, of smaller bore» than; water: line; 45 ,- . is, connected to 75. sure cylinder. 11 adjacent motor Z'kas-shown in , , 5 l 2,409,107 q 6 , Figure _1. A piston rod 18 extending from cyl inder-‘I‘I is secured to motor 24 and the motor is mounted upon'slideways 19; ' ' The operation of the valve mechanism in casing the lower chamber 85 to such an extent that the level of the liquid'normally in‘upper chamber '86 dr'ops,'?oat 89 will drop to'open the'valve 92 so‘ as to permit the'escape of 'gas through port 93. ~ 'I5'is such that if the level of the liquid in cham or Should the float 89 drop to a markedextent, a ber 63 drops, the valve mechanism will be actu switch in a casing '95 adjacent the upper'cham ber 86 ‘will ‘be'operate'd Iby vrod '9I to an opened position to open the circuit to the motor 24, there ated to cause pressure ?ow through line'16a so that this pressure will act upon one side of the piston in cylinder ‘I’! to draw motor-24 closer to the cylinder TI and also closer .to the gear reduc by stopping the entire apparatus. ' 'The‘gas ‘trap' I5 provided upon the water pump tion unit 22. Motor pulley 24a includes two ta I6 is illustrated in Figure 9 and includes a lower pered discs as described above in connection with‘ the speed-change device I9 and a decrease in the chamber 85a and an upper chamber 86a. Car bonated water enters the lower chamber‘ 85a from line H through an inlet port 96 which is distance between motor 24 and the gear ‘reduc tion unit 22 will therefore cause unit 22-'to be 15 offset with respect to the axis of the lower cham berso that the incoming water will be given a driven at a higher speed so as to increase the speed of the pumps I6 and 26 to supply more liquid to settling chamber 63. ‘ V ' ' swirling motion. In order that the ,swirlingmo tion will Ibe continued throughout the movement of the water throughv the chamber, the outlet line 'Iflthe ?oat 69 in the settling chamber is raised slightly by the liquid level, the’ valve mechanism‘ 20 91 which conducts the carbonated ‘water to the; controlled thereby will cause pressure to 'act through line 16b upon the opposite side of the water pump I6 isalso offset with respect to the axis of chamber 85. The gas trap I5 is otherwise piston in clinder ‘I1, thereby moving piston rod identical to the syrup gas trap 28. 18 to slide the motor 24 away from unit 22 so that Figure 2 diagrammatically illustrates the man. ner in which the various’ elements of the appara tus are electrically connected so that the‘ motor L’iwhich operates the water pump I6 and syrupv the speed of- the pumps ‘I6 and 26 will beide creased. As stated above, if the float 69 rises too far; the circuit to the motor 24 will be closed untilthe ?oat again drops somewhat. ‘ . The provision of the settling chamber 63 en ables the liquid to move to the reservoir 12 of the ?lling machine in a quieter condition than ’ would be the case if the reservoir received the liquid direct from the mixing device 46. _ _ ' - In order thatthe ?uid in ?lling machine reser voir 12, settling tank 63 and carbonator II) will . be under the same pressure,'the top portions of these three elements are connected by pressure equalizing lines 80 as indicated in Figure 1. This willv prevent a pressure lock at any point in the system. , " ' pump 26 will be stopped in the event that the ap paratus is producing too great a quantity of mixed beverage, or if the supply of water or syrup fails. Referring to Figure 2, it will be noted that a main I291 is connected to one connection of the motor 24 while another main I2I is connected to the ?oat operated control switch within the cas ing 15 of the settling chamber ‘63., Fromthis latter switch a series lead I22 extends to the'float control switch associated'with the gas trap_l5 of the water pump and a series lead I23 extends from this switch to the switch associated with the gas-trap 28 of the syrup pump. A lead I 240011 nects the last-mentioned switch with a normally closed trip switch I25 arranged at one side of I Settling chamber 63‘ is of such capacity that liquid will be held in the same for approximately the path of movement of the lever I42. A second ten minutes. That is, in normal operation, the normally closed trip switch I26 is positioned at chamber will be ?lled, and the pumps I6 and 26 will then stop until the level in'chamber 63 falls. as M the other side of the path of movement of lever 42. The provision of these two trip switches in During this settling period any ?ne bubbles in the sures that if the speed of movement of either of mixture willeither rise out of the mixture or > the meters 3I and 33 either drops or increases will go into solution. This action will be ‘aided to a marked extent, the motor 24 will be stopped by reason of the fact that the pressure in cham byreason of the fact that the lever 42 will actuate ber 63 is the same as‘in the carbonator ID, by one of the two trip switches to opened position. reason of the connecting lines 80. Also, the The slip clutches 36 and 36 illustrated in Figure settling chamber is insulated to maintain the mix 37 insure that the shafts 31 and 39 which carry ture at the proper cool temperature. It is de the traveling nut 40 will slip with respect to the sirable to provide such insulation at other parts of meter shafts 34 and 35 when the lever 42 con the ‘apparatus as is necessary to maintain the liq tacts with a trip switch and further swinging uldsv at proper temperature throughout travel movement of the lever is prevented. This ar through the various elements of the system. The gas trap 28 illustrated in Figure 1 as asso- ' rangement will prevent damage to the meters. ciated with the syrup- pump 26 is shown in de tail in Figures 7 and 8 and comprisesa lower chamber 85 and an upper chamber 86. The syrup inlet line 2''! enters the upper portion of the chamber 85 at a point offset with respect to the axis of the chamber so that the syrup will have a, swirling motion as it moves downwardly through thatchamber, to the line 81 which ex tends to the inlet of pump 26; The swirling mo tion of the liquid will allow any entrained gases to collect at the center and rise through-the short tube 88 extending from the central portion of the top of chamber 85 to the upper chamber 66., Chamber 86 has a float 89 therein including an arm 90 ?xed to a rod 91 journaled in the cham The two trip switches are connected in series rby a lead I2‘! and a series lead I28 extends from trip switch I26 to the motor 66 which operates the mixing device. 'From'mo-tor '59 a lead I29 extends to the other side of the motor 24. It will be observed from the above wiring dia-' gram'that motor 24 will be stopped if any of the switches in series circuit therewith is opened and that the mixing device motor 59 will be stopped at the same time. 7 r ‘ ' » It will be observed that the various controls I and speed-change arrangements included in the present apparatus will insure that so long as the apparatus is operating, a mixture of the proper proportions of the constituent liquids will be pro-' duced and that if conditions become‘ such that ber. Arm. 96 carries a ‘valve 92 normally adapted tov close an. escape port 93.. If gas or. air entersv v75 the apparatus cannot produce the properimix 2,408,107 8 ture, voperation will immediately terminate. This is,‘ of course, highly important in the production of soft drinks‘ because the failure to maintain the exactly proper ratios will not be apparent from a mere viewing of the bottled product and it is not practicable to test the mixture from time to time. Therefore, unless a mixing apparatus is fully controlled as described above, a large number of bottles might (be ?lled with a mixture fIclaimt'” ‘l. A device for‘mixing liquids comprising a chamber provided with a cylindrical bore includ-v ing an uninterrupted cylindrical surface, inlets for liquid adjacent one end of the chambergan outlet for liquid adjacent the opposite end of the chamber, a cylinder including a smooth periphery rotatable in the chamber, means to rotate the cylinder, the cylinder being of less'length than of improperly proportioned constituent liquids, 10 the chamber and positioned closely adjacent the inlet end thereof and being oi such diameter with involving a substantial waste in both ingredients respect to the inner diameter of the chamber as and labor. to provide an area of limited radius between the ' The operation of the apparatus and method cylinder and chamber walls in which liquids may isv as follows: The water flowed to the carbonator I0 is pref 15 be swirled together to mix, the radius of the area being so limited as to preclude foaming. erably ?ltered and de-aerated in accordance with 2. A device for mixing liquids comprising a the usual practice and is cooled to a temperature cylindrical chamber, a cylinder rotatable in the just above freezing. The syrup flowed to the ap chamber and spaced from ‘each end thereof, paratus throughout line 21 is also cooled to the proper temperature to cause it to properly mix 20 means to rotate the cylinder, and inlets for the liquids to be mixed at one end of the chamber, and so that it will not raise the water tempera at least one of the inlets being arranged to de ture too markedly. After carbonation the water liver liquid to the chamber at a point o?set with ?ows to the gas trap 15 and is then forced by respect to the axis of the rotatable cylinder. the pump IE to the meter 3 l . The incoming syrup 3. A device for mixing liquids comprising a moves through the gas trap 28 and is then deliv 25 cylindrical chamber, a cylinder rotatable in the ered by the pump 26 to the syrup meter 33. The chamber and spaced from each end thereof, the meters 3| and 33 will deliver the proper propor cylinder being provided with a smooth periphery, tions of syrup and Water, usually at the rate of means to rotate the cylinder, and inlets for liquids one ounce of syrup to five ounces of water, to the mixing device 41 where the two ingredients will 30 at one end of the chamber, at least one of the ‘ inlets being arranged to deliver liquid to the be thoroughly mixed without agitation and will chamber at a point offset with respect to the then flow through the line 62 to the settling axis of the rotatable cylinder. chamber 63 from which the mixture will move 4. In an apparatus for mixing liquids, a plu through line 'H to the usual reservoir 12 of the 35 rality of sources of liquids to be mixed, a liquid ?lling chamber. 7 mixing means, a plurality of liquid flow lines, Since the entire system will be kept at the each ?ow line extending between one of said water carbonating pressure, the mixture in the sources and said liquid mixing means, means in settling tank and in the ?lling machine reservoir will be under an excessive gas pressure so as to each line to move a liquid therethrough, a measur a point in advance of the ?lling machine reser voir 12 will permit the ?ne bubbles which may possibly be formed in the metering and mixing operations to pass either into solution or out of the liquid, insuring that the liquid can subse quently be quietly ?owed into the bottles by the rality of sources of liquids to be mixed, a liquid mixing means, a plurality of liquid flow ‘lines, each flow line extending between one of said sources and said liquid mixing means, means in increase its stability and permit ?lling at a 40 ing means in each line, and means controlled by said measuring means to hold all of said liquid greater range of temperatures. This renders the moving means at such relative speeds as to main system applicable to numerous types of ?lling tain a predetermined ratio of flow from said machines. measuring means. , The provision of the settling chamber 63 at ?lling machine. The inclusion in the system of a positively act ing mixing device will insure that the syrup will be uniformly dispersed throughout the carbon ated Water. However, it will be noted, as stated in detail above, that the mixing device 41' disclosed herein is of such type that the mixture will not vbe unduly agitated. The method included in the present invention of controlling the mixture by changing relative pump speed also contributes to smoother operation and decreases churning and agitation of the liquids moving through the sys tem. Althoughv the present method and apparatus have been generally described as adapted to handle the mixing of carbonated water and syrup, . it will be appreciated that the invention is ap plicable to the mixing of numerous other liquids, particularly those which must be mixed under 70 ' 5. In an apparatus for mixing liquids, a plu each line to move a liquid therethrough, a measuring means in each line, means controlled by said measuring means to hold all of said liquid moving means at such relative speeds as to main tain a predetermined ratio of ?ow from said measuring means, a settling tank to receive the mixed liquid from said mixing means, and means associated with said settling tank to control the operation of said liquid moving means. 6. In a liquid mixing apparatus, a casing pro vided with a vertically extending cylindrical bore of uniform diameter, an inlet tube for one liquid arranged concentric with the axis of the casing bore and opening to the upper end of the casing bore, a second inlet tube for a second liquid sur rounding and arranged concentrically with re spect to the ?rst-mentioned tube, means to flow liquid tangentially into said second tube whereby the second liquid will move into and downwardly in said second tube and thence into the casing bore with a swirling motion, a rotary drum mounted concentrically in the bore of said casing, The terminology used in the speci?cation is for said drum being of such diameter that only a small space will be provided between the drum the purpose of description and not of limitation, periphery and the casing bore, the upper end of the scope of the invention being set forth in the 75 said drum being positioned adjacent said concen claims.: ' pressure or which contain gas in solution. . 2,408,107 10 tric inlets so that the incoming liquids will move down upon the top of the drum, and means to rotate said drum with a movement faster than,’ mixing means, a plurality of liquid flow lines, oughly intermingled during movement down wardly between said drum and casing bore. by said measuring means to hold all of said liquid tance from the lower end of ‘the casing’ bore. speed of operation of said liquid moving means. each ?ow line extending between one of said sources and said liquid mixing means, means in each line to move a liquid therethrough, a the swirling motion of the liquid entering through said second tube so that the liquids will be thor 5 measuring means in each line, means controlled moving means at such relative speeds as to- main tain a predetermined ratio of flow from said '7' A liquid mixing apparatus of the character measuring means, a settling tank to receive the described in claim 6 ‘wherein the rotary drum is of substantially less length than the casing bore 10 mixed-liquid from said mixing means, and'means associated with said settling tank to control the and has its lower endspaceda substantial dis- ' 8. In an apparatus for mixing liquids, a plu rality of sour es of liquids to be mixed, a liquid ROBERT J. STEWART.