Патент USA US2130122код для вставки
Sept. 13, 1938. H. G. DYBVlG I BALANCING 2,130,122 ' MACHINE ‘ 5 Sheets-Sheét 1 Filed Jan. 18, 1937 32, 44 s4 38 26 38 Z2 20 I2 2-0 :2. FIG. 1. FIG 2,. _, BY Q - _ é INVENTOR. 691w X1 ' - ATTORNEY. Sept. 13, 1938. . H. e. D‘YBVIG 2,130,122. BALANCING MACHINE - Filéd< Jan. ‘18, 1937 i ( L 3 Sheets-Sheet 5‘ |———H|' m L Patented Sept. 13, 1938 2,130,122 UNITED STATES PATENT OFFICE ~ I 2,130,122 I BALANCING momma Henry G. Dybvig, Dayton. Ohio, assignm- to Harry . W. Moore, Dayton, Ohio Application January 18, 1937, Serial No. 121,183 ’ 12 Claims. (CI. 73-51) This invention relates to balancing machines respective of the position of the angle of unbal and in more particular to a balancing machine utilizing a‘ cathode-ray tube to indicate the angle of unbalance.‘ ance. Furthermore, it is very desirable to have a device that will indicate both the angle of un-‘ balance and the‘magnitude of unbalance upon » 5 In testing bodies for unbalance upon balancing machines, the vibration caused by the unbalance of the rotary body is. utilized in measuring the amplitude of vibration and the angle of unbal ance. This has been done electrically by various 10 devices, illustrative of which is a rotary light as, disclosed in the Harry Moore application Serial No. 104,075 ?led Oct. 5, 1936 for Dynamic bal-. ancing apparatus, and a plurality of stationary the same dial 'or screen instantaneously. This 5 device should preferably measure the angle of . unbalance irrespective of the speed of the rotat ing body and if an electrical contact is used, irrespective of the frequency of the pulsating cur rent. In other words, the circuit should ‘prefer- 10 ably show the angle of unbalance without anyv phase shift. This may be accomplished by util izing a circuit that does not have any inductances _ lights energized periodically through a suitable and capacities, as has been disclosed in the Moore 15 distributor, as disclosed in the Moore application Serial No. 680,225 ?led July 13, 1933 for Dynamic copending applications Serial Nos. 680,225 and 104,075 supra. When usinga cathode-ray oscillo balancing apparatus. graph for indicating the angle of unbalancethe An object of this invention is to provide a rotary ?eld either electrostatic or electromagnetic, de 20 ?eeting a cathode-ray periodically to thereby in dicate the angle of unbalance. ' Another object of this invention is to produce an electrically rotating ?eld by tapping an an nular resistance at a plurality of ‘points. 25 Another object of this invention is to generate’ two sign wave curves synchronized ‘with the ro tating body for producing a rotating ?eld. Another object of this invention is to provide‘ , a rotary ?eld, the magnitude of which may be 30 controlled so as to obtain the proper de?ection of voltage is applied to the de?ecting plates, there by eliminating any hazards incurred by the cur rent either lagging or leading the voltage. " . 20 Referring to the drawings, the reference num eral [0 indicates the base of a balancing machine having mounted thereupon a plurality of stand ards i2, each provided with a centrally disposed vibratory support l4 ?xedly mounted upon the 25 base ill and carrying a vibratory‘head it that may be locked in position by a pin I8 actuated from locked position to unlocked position by a ' suitable handle 20 passing through an angular pr diagonally disposedslot 22. When the pin or 30 latch I8 is in the “down” position the vibratory ‘ _ head It is free to oscillate upon the vibratory sup Other objects and advantages reside in the con . . struction of parts, the combination thereof and port I4. The vibratory head [6 may be provided with the mode of operation, as will become more ap_-_ suitable bearings .26 adapted to rotatably sup- 35 35 parent from the following description. ' I Fig. 1 is a schematic view showing a dynamic port the body 28 to be tested, which may be driven the cathode-ray, balancing machine similar to those disclosed in 'the above identi?ed Moore applications, having _ added thereto suitable attachments for use with v .40 a cathode-ray oscillograph. ' Fig. 2 discloses a transverse cross sectional view of the device disclosed in Fig. 1. ‘ Fig. '3 is an enlarged fragmentary detail view of a portion of the device disclosed in Fig. 2. 45 Fig. 4 is a schematic wiring diagram of the pre ferred embodiment. Fig. 5 discloses a schematic wiring diagram of a modi?cation. . I . Fig. 6 discloses a schematic wiring diagram of through a ?exible drive connection 30 from a suit able motor -32, provided with a speed control lever 34. . -' ' _ ' when the circuit through the motor is closed 40 the motor will rotate the body 28 to be tested at any speed desired by manually adjusting the lever 34. If the body to be tested is unbalanced, cen trifugal force will cause the vibratory head "5 lized to indicate the angle of unbalance and the ' magnitude of unbalance.- The device for in dicating the magnitude of unbalance will now be 50 50 another modi?cation. . Fig. 7 discloses a schematic wiring diagram of described. _ A gauge 38 may be mounted upon the standard a third modi?cation. In testing bodies for unbalance, it is very desir- _ I 2 and is provided with a suitable reciprocatory able to have an indicator that indicates the angle stem 40 actuated in one direction by an abutment 55 of unbalance instantaneously and accurately, ir . to oscillate upon the vibratory support It, that is, 45 when the pin. [8 is in the “down” position. The oscillation of the vibratory head 16 may be uti 42 mounted upon the oscillatory or~ vibratory 55 2 2,130,122 _ head I6. The stem 48 through a suitable me chanical amplifying device actuates a pointer 44 underlying a suitable dial on the gauge 38. The face of the dial may be, provided with suitable graduations having proper indicia from which ‘' Let it be assumed that the rotary contacts 88 and 88 rotate in a clockwise direction in syn chronism with the body 28.‘ > As the contact 88 rotates downwardly, it will eventually come in contact with the point 18 which is grounded; At the magnitude of .unbalance may be ascertained. - this instant of time the voltage supplied to the This magnitude of unbalance may be determined plate 88 will be zero. ' When in this position, the from suitable charts oriderived from formulas contact 88 will have rotated to a vertical position, applicable to'the body tested at the particular 10 frequency at which the reading is taken.‘ The stem 48 is preferably mounted for move ment in only one direction, that is, the stem 48 may be telescoped into the sleeve 46 butthe re turn movement is prevented by a latch 48 piv '15 otally mounted at '58 to a suitable bracket 52 ?xedly attached to the tubular sleeve 46. The stem 48 isi?rovided with a smooth surface that is engaged -by member 48 biased in a counter clockwise direction, as viewed in Fig. 2, by a 20 suitable spring 54. In order to release member 48 and the stem 48, it is merely necessary for ' the operator to actuate the push button 56, which rotates member 48 in a clockwise direction ‘ » against the spring 54 out of clearance with the 25 "surface of‘ the stem__48, thereby permitting the stem 48 and the pointer 44 to return to zero posi tion. A reduced tubular extension“ is provided as viewed in Fig. 4, being then supplied with the maximum positive voltage, so that the maximum 10 amount of positive voltage is supplied to the plate 88, assuming, of course, that the contacts 64 and 66 are closed at this instant of time. As the contacts continue rotating, the contact 88 will be supplied with a negative voltage, which 15 will be increasing and the contact 98 supplied with a positive voltage that is decreasing, until the contacts have rotated through another quadrant, when the contact 88 will be supplied with the maximum negative voltage and the con 20 tact 88 with zero voltage, again, assuming that . the contacts 64 and 66 are closed at this instant‘ of time. . It is well known to those skilled in the art that the cathode-ray is de?ected towards the positive‘ 25 plate and away from the negative plate. Fur thermore, it is well known that the magnitude of de?ection by either plate is proportional to with a slot for- member 48 and also carries a the voltage supplied to the plate. From this arrangement it can be readily seen that if the 30 30 bracket 68 adjustably mounted upon the exten sion 4| by a suitable screw 62. Bracket 68 on contacts .64 and 66 remain closed, the cathode its lower end carries a contact member 64 aligned ray will travel through a substantially circular with a contact member 66 mounted upon the ' path about the center of the screen I84. As the vibratory head I6 in such a relation that the cathode-ray will be de?ected only when the con tacts 64 and 66 are closed by the movement of 35 35 contacts,“ and 66 close an electrical circuit dur ing each revolution of the rotary body. The the vibratory support, the angle of unbalance contacts 64. and 66 are included in an electrical may‘ readily be determined. As the contact 64 circuit‘ including a device for indicating the angle of unbalance, which will now be described. 40 As may be best‘seen by referring to Fig. 4, the is carried by the tubular extension 4|, which adjustably supports bracket 68, this bracket 68 is preferably adjusted so that the contacts 64 contacts 64 and 66 are connected to a pair of - and 66 will remain closed for only a very short leads 68 and 18, the lead 68 being connected to one side of an annular resistance member 12 and the lead ‘I8 having its other end connected to one terminal of a battery ‘I5, having a terminal connected through a lead ‘I6 to the opposite side of the annular resistance member 12. The two halves of the annular resistance mem period of time during each revolution of the rotary body 28 when the body. is tested. If this period of time is too great, the bracket 68 may be adjusted by rotating the screw 62, so as to 45 cause the contact 64 to close for a sumcient period vof time. The angle of unbalance is preferably measured when the body rotates at a speed higher ber 12 are equally balanced, that is, the resist than the critical speed. ance of one half is equal to the resistance of the ' In the event that the voltage supplied by the battery ‘I5 does not produce the desired de?ec tion, resistances may be added to the battery other half, so that the midpoint indicated by reference character ‘I8 which has been grounded - . . has a zero potential. The resistance'element ‘I2 . circuit so as to reduce the battery voltage, there is connected to a cathode-ray tube by a circuit by reducing the magnitude of de?ection. If the voltage is insu?lcient across -the temiinals of the arrangement which includes the following ele ' battery 15, ampli?ers may be added to the circuit One de?ecting plate 88 of the cathode-ray tube‘ - between the slip rings 86 and 86 respectively, and is connected by a suitable lead 82 through a the plates 88 and 88. Any suitable cathode-ray brush 84 to the slip ring 86. This slip' ring 86 circiut may be used to amplify the signals or .is electrically connected to arotary contact arm voltages and to energize the cathode-ray tube. 88 contacting the resistance element ‘I2 and Such circuits are disclosed in ffThe Cathode-Ray . rotating'in synchronism with the body 28 to be Tube at Work” by Rider, published by John F. ments. tested. Rider, 1440 Broadway, New York city. V ,1 Another de?ecting plate 88 is connected by a In the modi?cation disclosed in Fig. 5 a pair 85 suitable lead 82 to a brush- 84 contacting with a of contacts H8 and H2 has been mounted upon second slip ring 86, electrically connected to a the vibratory support and a pair of cooperating rotary contact 88, also rotating in synchronism contacts H4 and II 6 has been mounted in ?xed with the body 28 tobe tested, but disposed at an ‘spaced relation from the contacts H8 and H2. angle of 90° from the rotary contact 88. This These contacts have been mounted between- the 70 arrangement supplies a; rotary' ?eld to the de?ecting plates 88-and 88 of the cathode-ray cathode-ray tube whenever the contacts 64 and tube and slip rings I28 and I22 respectively. 66 are closed. The plates I88 and-I82 in the vcathode-nary. tube, ‘oppositely ‘disposed with re spect to the plates 88 and 88 respectively, are 76 grounded. ' . ' The slip ring I28 is connected to one terminal of an armature or generator winding I24 mounted for rotation between a pair of poles I28 and I28. The other terminal of the winding I24 may be 75 3 2,130,122 grounded to the rotor shaft I30, grounded in any suitable manner. pressed upon the de?ecting plate 90 about the same time as the voltage generated by the coil _ The slip ring I22 is ‘connected to a winding I34, having the other end thereof grounded to the shaft I30. The winding I24 is displaced 90° I 24 also supplied to this plate 90 is zero, or very nearly so, the reading upon the cathode-ray tube will be very inde?nite and nearly meaningless. out of phase with the winding I34, so that the‘ If this is the case. the voltage generated by the phase displacement of the voltage that is_gener- - coil I50 should be impressed upon the de?ecting ated by'the two windings is 90°. For the sake‘ of plate 20. This may be accomplished by shifting clearness the windings I24 and I34 have been _ the-switch I50 from the terminal I60 to the ter 10 separated. These windings are-mounted upon minal I62 and the switch I66 from the terminal 10 the same laminated ‘core I35, rotating between I68 to the terminal "I, closing the switch I43 a single pair of pole pieces I26 and I28. By_clos and opening the switch I46. By so doing, the ing the contacts II 0 and II 4 and the contacts circuit is completed through the switch I43 from “2 and H6 by the vibration of the vibratory the winding I24 to the de?ecting plate 30 and the‘ 15 support, it can be readily seen that the cathode ray is de?ected upon the screen I04 to indicate the angleof unbalance. Y The magnitude of de ?ection may be controlled by a pair of suitable variable resistors I40 and I42 connected from 20 the high potential terminal of the windings -I24 circuit is completed through the winding I34 connected in series ‘withthe winding I50 to the de?ecting plate 20. > _ The switches I43, I46, I53 and I66 are prefer ably mounted upon a common actuator, so'that all the switches may be actuated simultaneously. and I34 to the’ ground. By adjusting the con so as to throw the coil I50 in series either with tacts, the magnitude of the voltage may be’ the coil I24 or with the coil I34. The voltage changed. ~ generated by the coil I50 may be ampli?ed by a In the modi?cation disclosed in both Figs. 4 suitable ampli?er I12. The resistors I40 and I42 and 5, the voltage applied to the‘de?ecting plates may be varied so as to control the voltage output of the coils I24 and I34. ' In some installai?ons it might be desirable to 80 and 90 is absolutely independent of the mag nitude of de?ection. The angleof unbalance is indicated and that is all. The magnitude, of un use one of the de?ector plates as a sweep circuit, balance is determined by the gauge 38 mounted that is, by connecting the plate to the A. C. winding, and to impress only the impulse voltage upon the other-plate. For the purpose of illustration. let it be assumed that the A. C. voltage generated by the coil I24 is supplied to the de?ecting'plate 90 and only the impulse voltage generated by the pick-up coil I50 is impressed upon the de?ecting upon the standards. _ ' In the modi?cation shown schematically in Fig. 6, a device for generating voltage in pro portion to the magnitude of unbalance has been shown. - - ,- ‘ In the modi?cation disclosed in Fig. 6. the con tacts actuated by the vibratory support have been plate 80. The alternating sine wave current will eliminated and instead thereof. an auxiliary volt then cause a straight horizontally disposed line age is generated in response to the vibration of to be shown on the screen I04,v that is. in the the vibratory support, which may be impressed absence of any voltage impulse being supplied ‘ 40 upon either one of the plates 80 or 90 to indicate ‘to the de?ecting plate 80. If the de?ecting plate the angle of ‘unbalance. 80 is connected to the coil I50. having its other A generator including the rotor windings I24 terminal grounded, the line across the face of and I34 generates a two phase alternating cur the screen I04 will be de?ected. From the de rent that is displaced 90° with respect to each l?ection it may readily be determined on which other in. a manner identical to that disclosed in side of the center thede?ection takes place, also the number of degrees the angle of unbalance is Fig. 5. The slip ring I20 connected to the wind ing I24 is connected by a lead I" through a from the vertical center axis of the screen; but the particular quadrant containing the de?ection switch I43‘ to the plate 90. The slip ring I22 sup plies a voltage through the lead I44, including a ' is inde?nite. If, for example, the de?ection takes place to the right of the vertical axis. the'angle 60 50 switch I 46. to the plate 80. 'oi' unbalance is located in either the ?rst or the In addition to these voltages an induction or pick-up coil I 50 is carried by- the vibratory head I6. This coil links a portion of the ?ux from the ?xed electromagnet I52. which may be either a permanent magnet or separately excited magnet. fourth quadrant. . By disconnecting the A. C. voltage supplied to the de?ecting plate 90 and disconnecting the plate at from the coil I50, and connecting this plate to the coil I34, a vertically disposed sweep circuit is obtained on the screen I04. Now, by excited from a suitable source of direct current. through the magnetic coil I54. As the coil- I5'1 vibrates with the vibratory support, the number of lines of ?ux linking the coil I50 varies. One connecting the voltage impulses supplied by the pick-up coil I50 to the plate 90, the sweep circuit line will be de?ected either above or below the center horizontal axis of the screen I04. If de-' ?ection takes place above the axis it is caused by 60 end I56 of the coil I50 is connected through a suitable switch I58 either to a terminal I60 in the lead I4I, or to a terminal I62‘ in the lead I44. The other terminal I64 of the coil I50 is con nected by a switch I66 either to the terminal I68 ,in the line I4I, or'the terminal I ‘I0 connected to the lead I44. The switches I58 and I66 should be closed through the same line simultaneouslv. that if it is desirable to connect the voltage an unbalanced condition in either the ?rst or the second quadrant; but from the horizontal sweep circuit line it was determined that the unbalance 65~ must be in either the ?rst or the fourth quad rants. This leaves the angle of unbalance in the ?rst quadrant. generated by the coil I50 into the circuit of the ' ' The same circuit arrangement may be used to de?ecting plate 90, switch~l58 is connected to the terminal I60, and the switch I66 to the terminal analyze unbalanced "conditions in bodies having both- rotary and reeiprocatory or other moving I68; At the same time the switch I43 should be open. This causes the voltage generated. by the coil I50 to be impressed upon the de?ecting parts, as for exampie airplane engines. The A. C. generator, including the coils I24 and I34, may then be driven in synchronism with the crank plate 90. In the event that this voltage is im~ shaft of the engine, and thepick-up coil I50 to- 7 2,180,122 gether with its associated magnet connected for changes may be made in the form, details, pro a relative movement with respect to each other on portion and arrangement of parts which generally the engine at various points to indicate the angle, ' stated consists in a device capable of carrying out the "degree, the period, the direction of vibratory the objects set forth, in the novel parts, combina tion of parts and mode' of operation, as disclosed movements and the phase relation of the vibra tory movements with respect to the crank shaft. and de?ned in the appended claims. Having thus described my invention, I claim: In the modi?cation disclosed in Fig. '7, the shaft I30 supports the. rotor I 3"- in close proximity to the vibratory head l6, so that the rotor I35, 1. A device for testing a' rotary body including means for rotating the body at high speed, a cathoderray oscillograph having a cathode-ray wardly and outwardly-from an E-shaped electro tube having means for de?ecting the cathode magnet I80 mounted upon a'?xed support I82. ' ray, means for producing a rotating ?eld for de Again, for_the purpose of clearness, the winding ?ecting the cathode-ray, said ?eld rotating in I24 has been separated from the winding I34, synchronism with the body to be tested, and means responsive to the unbalanced condition of 16 1-5 although in actual construction the two windings the body forcyclically energizing said de?ecting 10 including the windings I24 and I34, moves in would be mounted upon the'same laminated core and moving towards and away from the same electromagnet I80. The voltage generated by the windings) I24 and I34 will be in?uenced by the 20 relative position of the rotor I35 with respect'to the stator I80, that is, when the heavy part of the body to be tested actuates the rotor I35 to the right, as viewed in Fig. '7, the rotor is moved into or towards the magnet I80, so as to cause the 25 windings I24 and I34 to link a greater number of lines of ?ux. Now, as the heavy portion of the body actuates the rotor towards the ‘left, as viewed means of the cathode-ray tube from said rotating ?eld to thereby indicate'the angle of unbalance. 2. A device for testing a rotary body including means for rotating the body, means for produc ing an electrostatic ?eld rotating in synchronism with the body, a cathode-ray oscillograph includ ing a cathode-ray tube, and means responsive to the unbalanced condition of the body for cycli cally connecting the rotating electrostatic ?eld to the de?ecting plates of the cathode-ray tube. 3. .In a dynamic balancing machine for testing . a rotary body, vthe combination including means in Fig. '7, the rotor I35 links a lesser number of for rotating the body at high speed, means for lines of magnetic flux. Thus, it is seen that a generating a two phase alternating voltage syn 30 variable voltage is generated in the windings I 24. chronized with the rotating body, a cathode-ray and I34 that is supplied to the de?ecting plates 80 ~ oscillograph including a cathode-ray- tube, and means responding to the angle of unbalance of rangement, as may be readily seen, the angle of ' the body for connecting the alternating voltage unbalance .may be. determined by the relative to the cathode-ray tube to thereby indicate the and .90 of the cathode-ray tube. By this ar position of the curve or closed loop that is seen on the cathode-ray tube screen I04. A disc I90 mounted adjacent to the rotor I35 is adapted to abut a stop member I92 ?xedly mount ed upon the support I82 to prevent therotor I35 coming in direct contact with the electromagnet I80 if the swing of the vibratory. head I6 should become excessive. This prevents injury to the rotor and the stator. The disc I90 as shown rotates with the rotor I35. Instead of such a disc, 45 any suitable abutment member rotatably mounted upon the shaft I30 may abut member I92 carried upon the support I02 to prevent injury to the generator. \ . The voltages‘ supplied to- the generator plates may be controlled by adjusting the variable resist ors I40 and I42. These resistors may be adjusted by a graduated'knob or dial I45.‘ The cathode ray may be adjusted to a predetermined position on the screen I04 by turning the knobs I45 either 55 to the right or to the left. The amplitude of. de?ection of the body to be tested may be deter mined by the adjustment of the knobs I45 in the modi?cations disclosed in Figs. 6 and 7. Each angle of unbalance. ‘ _ 4. In a dynamic balancing machine for testing ' the angle and magnitude of unbalance of a ro tary body, the combination including a'vibratory support for the body to be tested, means for ro tating the body-at high speed upon the vibratory support, a cathode-ray oscillograph including a -cathode-ray~tube having ,a screen, means inter connected to the, de?ecting plates of the cathode ray tube for generating polyphase alternating current synchronized with the rotation of the body to be tested, and auxiliary means for gener ating a voltage responsive to the angle of unbal-I ance transmitted to the vibratory support selec tively supplied to the de?ecting plates to indicate the angle and magnitude of unbalance. 5. ‘In a dynamic balancing ‘machine .for testing rotary bodies for unbalance, the combination in cluding a vibratory support for the body to be tested, means for rotating the body mounted upon the vibratory support, a cathode-ray oscillograph including a cathode-ray tube having means when energized for de?ecting the cathode-ray, voltage generating means for generating polyphase volt graduation on these knobs may represent a cer vages energizing said de?'ecting means, said volttain weight required to counteract the unbalanced age generating means being'synchronized with condition of the body tested. The magnitude of the-rotation of the body to be tested, auxiliary weight, of course, is determined from experiments means for generating a voltage responsive to the upon like bodies. ' angle and degree of unbalance transmitted to the In addition thereto if necessary the voltages vibratory support by the body; and means for may be ampli?ed through suitable amplifying selectively supplying the voltage resp0nsive_'to means generally found within conventional the angle. and degree of unbalance to the de?ect- ‘ cathode-ray os‘cillographs- now on the market. These amplifying means are generally controlled ‘ ing'means to indicate the angle and degree of by a graduated dial, so that the degree of ampli? 6. In a device of the character described, the 70 70 cation may be obtained from the dial reading and combination of a cathode-ray oscillograph in unbalance. thereby the-magnitude of unbalance may be‘ determined. , _, .. Although thelpreferre'dmodi?cation of the de vice'has been described, it will be-understood that 75 within the .purview of this invention various _ _ _ _ cluding a cathode-ray tube having means for de?ecting the cathode-ray’when, energized, with ' means for generating polyphase alternating volt- ages suppliedto the- de?ecting means: for ener 76 5 2,180,122 gizing the same, and means for cyclically dis turbing the energization of said de?ecting means, the phase relation of said disturbing means being indicated upon the screen of the cathode-ray oscillograph. "I. In a device of the character described for use with a body having periodic movements, the combination including. a cathode-ray oscillograph having a cathode-ray tube provided with means 10’ for de?ecting the cathode-ray when energized, means for generating pulsating voltages synchro nized with the movement of the body, and means for cyclically interconnecting the‘ voltage gener ating means with the de?ecting means of the 15 cathode-ray oscillograph for indicating the rela tive phase relation of the voltage impulses to the‘ movement of the body. 8. In a device of the character described for use with a body having. rotary movements and vibratory movements, the combination including a cathode~ray oscillograph having a cathode-ray tube provided with means for de?ecting the cathode-ray, current generating means for gen erating polyphase alternating current synchro 25 nized with the rotation of the body for energiz ing the de?ecting means of the cathode-ray tube so as to supply a rotary ?eld to the de?ecting means, and auxiliary current generating means generating a current synchronized with the vi 30 bratory movement of the body, said auxiliary means energizing the de?ecting means of the cathode-ray tube cyclically so as to indicate the phase relation between the vibratory movements and the rotary movements of the body. 9. In a device of the character described for use with a body having cyclic movements, the combination of a cathode-ray oscillograph hav ing a cathode-ray tube provided with means for de?ecting the cathode-rayv horizontally, and 10. In a device of the character described for analyzing parasitic vibrations in bodies includ ing rotary parts, the combination of a cathode ray oscillograph including a cathode-ray tube having means for'de?ecting the cathodel-ray with $1 current generating means for energizing said de ?ecting means, said current generating means in cluding an A. C. current generator synchronized with a-rotary part of.the body to be analyzed for energizing said de?ecting means, and current . generating means responding to vibratory move ments caused by the body to be energized, said second current generating means also energiz ing the de?ecting means so as to indicate the angular relation and the magnitude of the vibra tory movements. 11. In a device of the character described for analyzing parasitic vibrations in bodies includ ing rotary parts, the combinationof a cathode ray oscillograph including a cathode-ray tube‘ 20 having vertical and horizontal cathode-ray de ?ecting means with current generating means for cyclically energizing the vertical de?ecting means in synchronism. with the rotation of a ro tary part of the body, a second current generat 25 ing means responsive to the vibratory movements of the body to be analyzed for energizing the horizontal de?ecting means, and graduated means for indicating the magnitude of parasitic vibrations of the body. 30 12. In a device of the character described for analyzing parasitic vibrations in bodies includ ing rotary parts, the combination of a, cathode ray oscillograph including a cathode-ray tube having vertical and horizontal cathode-ray de ?ecting means with current generating means for cyclically energizing the vertical de?ecting means in synchronism with the rotation of a ro tary part of the body, a second current generat 40 means for de?ecting the cathode-ray vertically _ ing‘ means responsive to the vibratory movements 40 with current generating means for generating‘ currents, synchronized with the cyclic vibratory movements of the body, and means for cyclically supplying the generated currents selectively ‘to 45 the horizontal de?ecting means and the vertical de?ecting means for indicating the phase rela-z ‘ tion between the generating means and the cyclic movements of the body. of the body to be analyzed for energizing the horizontal de?ecting means, and graduated means for controlling the de?ection of the cath ode-ray, said graduated means indicating the magnitude of the parasitic vibrations. m’ germ-wits?- '