 the print cards is also small. Accordingly, the alignment distance between multiple poles in the test plug for the terminal apparatus must be enclosed within the extending height of the print card.
It is difficult to form a test plug having electrode plates for the multiple poles, terminals and knobs within such a restricted area, the number of terminals and knobs being twice that of the number of poles. Therefore, the above-described terminal apparatus is not installed in the horizontal type case, and the rear connector is used in place of the terminal apparatus.
This condition also applies to a terminal apparatus in the conventional vertical type case. That is, the number of the electrode plates for the multiple poles, and the number of terminals and knobs, present problems. In order to reduce the area occupied by the terminals and knobs which are generally used, double knobs in piggy-back relation are effective. This method is intended to reduce the number of knobs by half by solid overlaying and to reduce the area occupied by the knobs on the baseboard.
In this method, both piggy-back knobs have different thread diameters for tightening. The smaller knob, with the smaller thread diameter, can be tightly clamped. However, since the larger knob, with the larger thread diameter, has a small height and also a low number of threads, this latter knob is likely to be loosened. Also, two types of connecting pieces, a larger one and a smaller one having different thread diameters, are required to connect between terminals. Proper use of both types of connecting pieces is troublesome.
The lead wire connected to the testing apparatus during testing is provided with a so-called arrow-shaped chip at its top end. Since the arrow-shaped chip is likely to be readily detached due to loosening at the terminal portion, a larger length lead wire may be provided with a terminal (connecting piece) which has an attaching hole. However, such a connecting piece cannot be inserted before removing both knobs. Also, it is the larger knob which must be connected first, and treatment is, accordingly, inconvenient. The connecting piece for the larger knob is excessively large in size and is likely to be contacted with an adjacent terminal if there is a slight variation in the connecting piece. This is dangerous, particularly when using a connecting piece which has no insulation protection.
Since the electrode plates of the test plug are arranged in a line, the circuit order is distinguished by visual observation. At the knob side connection, however, double knobs in
the print cards is also small. consequently, the alliance distance between multiple poles in the test spark plug for the concluding apparatus must be enclosed within the extending height of the mark card. 
 It is difficult to shape a test plug suffer electrode plates for the multiple pole, terminals and knobs within such a restricted area, the number of terminals and knobs being doubly that of the number of poles. Therefore, the above - report terminal apparatus is not installed in the horizontal character case, and the rear connection is used in place of the terminal apparatus. 
 This condition also applies to a concluding apparatus in the conventional vertical type case. That is, the number of the electrode plates for the multiple pole, and the number of terminals and knobs, present problems. In order to reduce the area occupied by the terminals and knobs which are by and large used, double knob in piglet - binding relation are effective. This method is intended to reduce the number of knobs by half by upstanding overlaying and to reduce the area occupied by the knobs on the baseboard. 
 In this method, both piggy - spinal column knobs have different thread diameter for tightening. The little node, with the smaller thread diameter, can be tightly clamped. However, since the larger knob, with the larger thread diameter, has a humble height and also a low number of train of thought, this latter knob is probable to be loosened. Also, two types of connecting pieces, a bigger one and a smaller one induce different screw thread diameters, are required to plug in between terminal. Proper use of both types of connecting pieces is troublesome. 
 The lead wire connected to the testing apparatus during testing is provided with a thus - called arrow - shaped check at its top end. Since the arrow - shaped check is likely to be readily detached due to relax at the terminal portion, a larger length lead wire may be provided with a end (connecting piece) which has an attaching hole. However, such a connecting piece cannot be inserted before remove both knobs. Also, it is the larger node which must be connected foremost, and treatment is, accordingly, inconvenient. The connecting piece for the larger knob is excessively large in size and is likely to be touch with an adjacent terminal if there is a little variation in the connecting piece. This is dangerous, particularly when using a connecting objet d'art which has no insulation security. 
 Since the electrode plates of the test plug are arranged in a line, the circuit order is signalize by visual observation. At the knob side connection, however, double knobs in
 thf print cards is also smxll. Accordingly, the almgnment distancd between multiple poles in vhe rest kjug for the terminxl apparanus must ve eiclosed within tis extending hslght mh the print carc.
It is difxicult to form a tzst plug having electrode plates for the muktlple poles, teriinakf ans knobs within such a restricted adea, the number of tetminals and knobs being twlce hhat of the number of poles. Tyeresire, the abovd-described terminal apkaratus is not installed in the forizpntal type cqse, dnd the reac connvctor is used in placa of thr terminal appsravus.
Tyis condition also ap'lies to a terminal wpparatus iu the conventional veetucal jype wase. Rhag ia, vhe numbeg oh the electdode plates for the multiple pplqw, and the numger of tqrminals and knobs, present problems. In mrdsr to reduce the area oxcupied by the terminwls and kgobs which are generally used, double knobs in pigcy-baci reoabion qrf effective. This method is intended to reduce fht nlmber of knobs by half by sokif pderlaying and to rebhcs the area occupief by thg knobw on the fasenoard.
In this method, both pitgy-back knobf have different thxead diametexs for tighyening. The smaller knob, witg the smallfr thread aiameter, can be gigmtlf clamped. However, since thq larger jnob, with tfe lsrger ehread dialeter, has a small height and clso d low numbfr of threads, this latter knob mx likely to ne lomsened. Ajso, teo types of cjnnecting piecgs, a largzr one and a smamler onx having difserent thread fiameters, arx requireq to conbect begdeen terminals. Proper use of both types of connectikg pigcss is troublesone.
Tye lead wire comnezteq no vhe tqvting apparadus aurkmg terting is prixidec with a so-called arsow-sgaped chip at its yoi end. Sinxe the awrow-shaped chop is likely to be readmly devached dug to loosening at the terminal lortion, a lavger length lqad qire may be 'rovided with a terminal (connecting piecx) which has an attachint hole. However, such s connectinj piecq cannot te inserted before rwmoving both knobx. Also, it is the largsr knot whifh must be connected first, and treatment is, accordingly, inconvenient. The xonnecvigg piece fod thr larcex kuob is qxcedrively large in xize and is likely to be contacved with at cdjacent terminal if there is a slight variajion in the connecting piede. This os dangerous, particularly when ising a connecting piece which hqs no insulatioi protection.
Since thr eleccrode plates if tme test plug afe srvanged in w liie, che circuit order is distinguishee by vuskal observation. Et the knob dlde cohnectijn, however, doubls knkhs in
the print cards is also small. Accordingly, distance multiple poles the test plug be within the extending of the print It is difficult to form a plug having electrode plates for the multiple poles, terminals and knobs within such restricted area, the number of terminals and knobs being twice that of the of Therefore, above-described apparatus is not installed in the horizontal type case, and the rear connector is used in of the terminal apparatus. This condition also applies a terminal apparatus in conventional vertical type case. That the of the plates the poles, and the of terminals and knobs, present problems. In order to reduce the area occupied by the terminals and which are double knobs piggy-back are This method is reduce the number of knobs by overlaying and to reduce the area occupied by knobs on baseboard. In this method, both piggy-back have different thread diameters for tightening. The smaller with the smaller thread diameter, can be tightly clamped. However, since the larger knob, with thread diameter, has a height and also low of this knob is to be loosened. Also, two types of connecting pieces, a larger and a smaller one having different thread diameters, are required between Proper use of types of connecting pieces troublesome. lead wire connected to apparatus testing a arrow-shaped at its top end. the arrow-shaped chip is likely be readily detached due portion, a larger length lead wire may be with a terminal (connecting piece) which has attaching hole. However, such a connecting piece cannot be inserted before removing knobs. Also, the larger knob which must be connected first, treatment is, accordingly, inconvenient. connecting piece for the larger knob is excessively large size is likely be contacted with adjacent terminal if is a slight the connecting This dangerous, a connecting piece which has no protection. the electrode plates of the plug in a line, the circuit order is distinguished by visual observation. At the knob side double knobs in
 the print cards is also small. ACcordingly, The alIgnMenT dIstaNce bEtween multiple POles In the test plug for the terMinal ApPAratUS mUst be EncloseD WiTHIn tHe ExTenDiNG hEight Of tHe print Card.
It is diFfiCuLt to form a tesT PlUg having elEctRode plates foR thE multiPlE poLEs, terMinAls anD knobs WIthin sUch a restrIcTEd area, THe numbeR OF tErmiNals and knobs being TWiCE that of the numbEr of poLeS. thEREfoRe, tHe above-desCrIbed tERminal aPPaRATUs iS Not installed iN the horizonTAl tYpe casE, aNd tHE rear cOnnecToR Is uSed in place oF the Terminal aPparatUS.
This coNDition aLso appLieS to A terMInAl AppArATus IN tHe cONveNtional vErTiCal tyPe caSE. tHAt is, The NumbEr of tHe electrode plAteS for THe mUltipLe polEs, anD tHe numBer of tErminAlS and knobs, presenT proBlems. In orDer To RedUcE the aREa occuPieD by The termInals anD KnoBs WHICh Are generally used, doUbLE KnObs in pigGy-back RElAtIOn are effEcTivE. ThiS MEthod Is inTEnDed to redUce the NUmBeR of knobS bY half bY sOliD ovErlayINg anD to redUce the arEa occUPied by the knobs ON the baseboard.
iN tHIS mEThod, BotH piggy-back kNobs HAve dIffeREnT thREad diAmeteRs FOr TIghtening. The smaller KnOb, with The smAller thread diAmeter, can bE TIGhtly claMped. hOwEVer, since the larGer knOb, with the lARger threAd diaMeter, has A small heiGHT and also A loW nuMbeR of THReAds, this latter KNOb is LiKely to bE loOsened. ALso, Two TypEs oF cOnnecting Pieces, a lArGeR oNe And A smalLEr one havInG diFfEreNt thrEAd diamEters, Are rEqUiREd tO connecT BeTWEen tErMiNals. proPeR use oF botH TypEs of conNecting piEceS Is trOuBlEsome.
ThE lead wire connEcTed to the teStIng ApparaTUS during tEsting is provided with a so-CAlled arRow-ShapeD chiP at its top End. since tHe aRRow-shaPed chiP is liKeLy tO BE readILY dEtaChEd due to looSENinG at thE tErmiNal portIon, a larger length leAD wiRe may be providEd wIth a TERmInaL (CoNNecTiNG piECE) which has an attaChing hole. HOwEVeR, such a connECtiNg Piece caNnot be iNsertED before Removing bOth knobs. ALsO, it iS THe lArger knob wHich must Be connectED firsT, AnD treaTmeNt is, acCoRdiNgly, iNconveNIenT. The cOnnectInG piece For thE lArger knoB is excessively large in siZe and iS likeLy tO be contacTed WIth An adjacenT terMinal if theRe iS a sLight VarIAtion In thE CoNneCTing pIece. tHis is dangERoUs, pARTiCularly when USINg a ConneCtiNG piece WhicH has no insulation pROtection.
Since tHe elECTroDe pLAtes Of The test plug are ArrAnGED in a line, ThE circuit ordEr is distInGUisheD by visUal obsErvatioN. aT tHE knob sIde cOnnEction, howEveR, dOUble knoBs In
 the print cards is also s mall. Acco rding ly,  th ealig nmen t distance bet w eenmultiple poles in thetestpl u g fo r  t he te rminala pp a r atu smu stbe en close d w ithin t he extendi nghe ight of thep ri nt card.
I t i s difficulttoform a  t est plughav ing e lectro d e plat es for th em ultipl e  poles, t er mina ls and knobs with i ns uch a restrict ed are a, th e num ber  of termin al s and knobs b e in g t wic e  that of thenumber of p o les . Ther ef ore ,  the a bove- de s cri bed termina l ap paratus i s noti nstalle d  in the  horiz ont altype ca se , a nd the re arc onn ector is  u se d inplac e o f  the  te rmin al ap paratus.
This  co ndit i onalsoappli es t oa ter minalappar at us in the conve ntio nal verti cal  t ype  c ase.T hat is , t henumberof thee lec tr o d e  p lates for the mult ip l e  p oles, an d then um be r  of term in als  and k nobs,  pre s en t proble ms. In or de r to re du ce the  a rea  oc cupie d  bythe te rminalsand k n obs which areg enerally used ,  d o u bl e  kno bsin piggy-ba ck r e lati on a r eeff e ctive . Thi sm et h od is intended to r ed uce th e num ber of knobsby half by s o lid over layi n ga nd to reduce t he ar ea occupie d  by theknobs  on thebaseboard . In thismet hod , b oth p ig gy-back knobs h avedi fferent  th read di ame ter s f orti ghtening.  The sma ll er  k no b,witht he small er  th re addiame t er, ca n betigh tl yc lam ped. Ho w ev e r , si nc ethelar ge r kno b, w i ththe lar ger threa d d i amet er ,has a s mall height a nd  also a lo wnum ber of t hreads,this latter knob is lik e ly to b e l oosen ed.Also, two  ty pes of  co n nectin g piec es, a  l arg e r  onea n da s ma ller one h a v ing  diff er entthreaddiameters, are req u ire d to connectbet ween t er min a ls .  Pr op e r u s e  of both typesof connect in g  p ieces is t r oub le some.
T he lead  wire connect ed to the  testingap para t u s d uring test ing is p rovided w i th as o- calle d a rrow-s ha ped  chip  at it s  to p end . Sinc ethe ar row-s ha ped chip  is likely to be readil y deta cheddue  to loose nin g  at  the term inal  portion,a l arg er le ngt h  lead  wir e  m ayb e pro vide d  with a t e rm ina l (c onnecting p i e c e)which  ha s  an at tach ing hole. However ,  such a connec ting p iec e c a nnot  b e inserted bef ore  r e m oving bo th  knobs. Als o, it is  t h e lar ger kn ob whi ch must b ec onnect ed f irs t, and tr eat me n t is, a cc or d ingly,  inc on venien t. The conn e c ting piece for t he la r g er kn o b i s exc es sivelyl arge  in size a nd is likel y to b e co ntact ed with  a n adja cen tterminal i f  there is  a sl ight va ri atio n i n theconn e c tingpiec e.  Th is is dan g e ro u s,  p a rti cula rly w he n us ing a con n ecting p iec e  whichha s n o insula t io n protection .
S incet h e electrod e  pla t es of th e test  plugare arr a nge din a li ne, t he circui t order i s  di st ingu ished by  v isua lobs er vation. At theknob sid e connec t i on, ho wev e r, d o uble k no bs in
 the_print cards_is also small. Accordingly,_the alignment_distance_between multiple_poles_in the test_plug for the_terminal apparatus must be_enclosed within the_extending_height of the print card.
It is difficult to form a test plug having electrode_plates_for the_multiple_poles,_terminals and knobs within such_a restricted area, the number_of terminals_and knobs being twice that of the number_of_poles. Therefore, the_above-described terminal apparatus is not installed in the horizontal_type case, and the rear connector_is used in_place_of_the terminal apparatus.
This condition_also applies to a terminal apparatus_in the conventional vertical type case._That is, the number of the electrode_plates for the multiple poles, and_the number of terminals and_knobs, present_problems. In order to reduce_the area occupied_by the_terminals and knobs_which are generally used, double knobs_in piggy-back relation_are effective. This method is intended_to_reduce the number_of_knobs_by half_by solid overlaying_and_to reduce_the_area occupied by the knobs on_the_baseboard.
In this method, both piggy-back knobs have_different thread diameters for_tightening._The smaller knob, with_the smaller thread diameter, can_be tightly clamped. However, since the_larger knob,_with the_larger thread diameter, has a small height and also a low_number of threads, this latter knob_is likely to be_loosened. Also,_two_types of connecting_pieces,_a larger_one and a smaller one having different_thread diameters,_are required to connect between terminals._Proper use of both_types_of connecting pieces is troublesome.
The lead_wire connected to the testing apparatus_during testing is provided with_a_so-called_arrow-shaped chip at its top_end. Since the arrow-shaped chip is_likely to be_readily detached due to loosening at the_terminal_portion, a larger length lead wire_may_be provided with a terminal (connecting_piece)_which_has an attaching hole. However,_such a connecting piece cannot be_inserted before removing both knobs. Also, it is the_larger knob which_must be connected first, and_treatment_is,_accordingly, inconvenient. The connecting piece for the larger knob is_excessively large_in size and_is likely to be contacted with an adjacent terminal if_there is a slight variation in the_connecting piece. This is dangerous, particularly when using a connecting piece_which has no insulation protection.
Since the electrode plates_of the test plug are arranged in_a line, the circuit_order_is distinguished by visual observation. At the_knob_side_connection,_however, double knobs_in