IIEMONTOIR. 



jiirt to efcape touching the ends of the balance-wheel's tion of the arrow Z, by the adlion of the niain-fprinjr, 

 teeth in its refling pofition, and the notch cut in this pallet through the train, whenever the finglc detent d is by any 

 is to receive the impulfe of any tooth of the laid wheel that force impelled hack to its baiikijig. Lot it alfo be con- 

 may, at any time, aft againll it, in paffing the line A B. ceived that, when the I'nail-pallct N is carried by any means 

 .Full above this large pallet i,-; fixed, by friftion, another in a dircdtion contrary to that of the wheel till it reaches 

 I mailer pallet N, of ftecl, in the form of a fnail-picce, and the pallet »• of the rcmontoir or double detent-fpring, the 

 iiaving iiifcrted into it, near the centre of motion, and at right remointoir-fpring is wound up by fuch motion, and i>iV« 

 angles, a Imall ruby pallet, which points direftly to the verfa, and alfo'that when the ilruke of the fnail-paliet has 

 radial end of the notch cut in the large pallet M. A fmall driven back this detent to its banking, by linking the floped 

 collet, twiflcd fall to the axis of the rcmontoir, juR above face of the ruby pallet r, the detent will inltantly return by 

 this fnail-pallet, receives the lower end of the fpring R, tlie force of its elalticity, and the back part of the faid 

 while the upper end is made fall to a piece in the cock H, ruby palK't r will hold tlie fnail-pallet locked at its return, 

 near W, in a manner funilar to that by which the pendulum- till fomc other mipuHe lets it free again ; but that when the 

 fpring is fixed. On the arbor ot the remontoir, and under unlocking takes place, the ipring of the rcmontoir, now 

 the plate A B, is twifled on a pallet I, which may be called wound up, returns by its own force to its original filuation ; 

 the remontoir's impelling pallet, becaufe it gives motion to and that its axis brings back with it its affixed pallets, 

 the balance by ilriking tlie pallet K, which the author alfo Fi^. 1. will be of no ufc in defcribing the adtion of this 

 called tlie impellhig pallet ; but is, as we have named it, more elcapement, but mjig. 2. the parts are reprefented in a ftate 

 properly the impelled pallet, becaufe it receives the impulfe ready to commence motion ; the wheel is locked by tooth 3 

 which pallet I imparts. From this detail of the pallets it is againll the fapphire pallet s of the fiiigle detent d, and 

 obvious, that whenever the balance-wheel impels the large the remontoir-fpriiig is wound up, and kept locked by the 

 pallet M, the remontoir-fpring R, the fnail-pallet N, toge- fnail-pallet, refting behind the ruby pallet r of the double 

 ther with its fmall ruby pallet and impelling pallet I, mud detent : in this fituation let the balance be wound round in 

 have a contemporary motion, and will defcribe each its refpec- fuch diredtion that the difcharging pallet I may Itrike the 

 tive circle round the common arbor W V. end of tlie double or remontoir detent outwards, taking 



In_yff. 2, (J is a detent-fpring, fixed by a fcrew and fteady both its fprings along with it, and thereby unlocking 

 pin to the upper face of the potance plate, and pointing the fnail-pallet ; at this inllant the remontoir-fpring R 

 direttly to tliv axis of the verge, which it nearly approaches, begins to return, and brings all its four pallets with it, and 

 Its lliape and mode of being fixed will be better underltood during the return, pallet L, which we have called the impel- 

 from an infpeftiou ol Jl^r. j, which gives a fide view of it, ling pallet, gives its flroke to pallet K on the verge, which 

 and from which it will be fcen that it is placed high enough w-e have called the impelled pallet, and through its medium 

 above the plate, to come in the way of the difcharging pal- to the balance itfelf, which now goes on m its ofcillation, 

 let I, in each revolution of the latter. Upon the fide of till the pendulum or balance-fpring is wound up ; in the mean 

 the faid detent-fpring a, next to the balance-wheel, a fecond, time the little unlocking ruby pallet, inferted into the fnail- 

 but very flender fpring is pinned, fo that its projedling end pallet near its centre of motion, meets with the extreme end of 

 exceeds that of the detent-fpring, and comes nearer to the detent //, and drives it back to its banking, thereby fetting the 

 balance verge than that of the detent, as reprefented at »i, tooth 3 of the wheel free from the fapphire pallet j; the wheel, 

 in fig. 3. To the detent-fpring is made fail a fmall ruby being urged by the train, now proceeds till tooth 2 falls into 

 pallet r, feen alfo in_y?f. 3. The cock ^ is fcrewed to the the notch of pallet M, and is checked, experiencing a little re- 

 potance, and the hole at i is tapped to receive the fcrew c, coil ; the balance-fpring, being now wound up, returns, and 

 the head of which, being turned towards the centre of the alfo the wheel winds up the remontoir-fpring, till it is again 

 fnail, forms a banking for the detent-fpring a, when ilruck by locked, by the fnail-pallet, after its impulfe has driven back 

 the fnail-pallet. This fcrew, c, is removed from its due place the detent : during this attion the detent ^returns by its own 

 in the drawing, to avoid confufion; and for a reafon, which will fpring, and locks tooth 4 of the wheel, at the inflant that 

 prefently appear, this double fpnng « may be called the re- tooth 2 efc<ipes from the notcli of pallet M, and the original 

 montoir-detent. On another fide of the balance-wheel a fecond fituation of all the afting parts is now reftorcd, except that 

 detent-fpring d is fixed, pointing towards the centre of the the motion of the balance is not arretted, the flender fpring 

 remontoir axis, and forming nearly a right angle with the fixed to detent a allowing it to pafs in the return, without 

 former detent : this fecond detent is adjufted by the fcrew j. unlocking the faid detent ; but whea the backward ofcillation 

 The fhape and fituation of this fecond detent, which may is finilhed, and the balance returns, the fame operation is re- 

 be called the locki.- g detent of the balance-wheel, is better peated ; ;'. e. the remontoir detent is unlocked, the pallets on 

 feen in Jig. 4, where its fapphire pallet s may be diflinguiih- its axis are brought back, the impulfe is next given to pallet 

 ed, againfl which the tooth 3 of the wheel is fuppoied to K of the balance, to reflore its lofs of momentum, and 

 be refling in fig. 2. The fituation of tliis pallet s, as ad- laftly, the wheel is unlocked to wind up the remontoir-fpring 

 jufted by the fcrew y, determines the refting places of the as before. 



teeth I and 2, while they are equally free from the edge of The obfervation we have to make on this ingenious re- 

 the pallet M. The locking detent d is hkewife made fall by montoir efcapement is this, that on enquiry from good 

 3 fcrew to the upper face of the potance plate ; and the authority we learn, that the theory could never be com- 

 fcrcw y, placed in the cock e, but out of its place in the pletely put into praftice by the inventor, though he laboured 

 figure, forms a banking to the fapphire pallet s, while the to obtain his objeft lull fourteen years. However well the 

 fcrew ^, in a fmaller cock, limits the excurfion of the detent- parts of aftion were mechanically made, the locking of 

 fpring d itfelf. the remontoir-fpring was never certain, for the_^;Vr given to 



Having defcribed the various pieces of mechanifm that the ruby pallet r by the fnail-pallet, drove back the detent 

 compofe this rcmontoir efcapement, we will nov/ proceed to fo far, as frequently to enable the fnail to be brought back by 

 explain its mode of afting. Firll, let us fuppofe all the the remontoir-fpring, before the detent returned to catch it, 

 parts at reft with the wheel locked by the pallet s lafl the confequence of which was, that the pallets of the remon- 

 defcribed, but that the wheel is ready t« move in the direc- toir axis were all brought back, and the impulfe vainly ex=. 

 Vol.. XXIX. 4 Q per.ded 



