WATCH. 



ratchet, and the four teeth of the fmall ratchet, muft, by 

 being in advance of the other twelve teeth of the great 

 ratchet, be carried forward, and fo fituated, if not prevented 

 by fome external caufe, as invariably to occafion the watch 

 to repeat the three-quarters and half-quarter, after the hour, 

 every time the watch is made to repeat. Such effeit is pre- 

 vented taking place by the aftion of the quarter-rack : the 

 extremity of this rack is cut into eight teeth ; (the afting 

 face only of the firft tooth being cut, and the remainder 

 of that tooth left fohd, to infure the fafe aftion of the 

 little all-or-nothing piece I, when the watch has finifhed 

 ftriking, ) and thefe eight teeth correfpond with and are 

 proportionate to the eight fleps in the quarter-fnail ; if the 

 hour only is to be ftruck, tlie quarter-fnail is fo fituated 

 with refpeft to the quarter-rack, that the arm y, of the 

 latter, defcends to the deepeft ftep in the fnail, allowing the 

 firft tooth of the eight juft to pafs the ftiort lever, or, as it is 

 frequently called, /la/Zc/ of the little all-or-nothing piece I, and, 

 from the conftruftion of the parts, the quarter-rack is in 

 fuch a fituation, relative to the great rack, that the latter, 

 through the medium of the pin 3, coming into contaft with 

 it, at the inflant the laft blow of the hour is ftruck, carries 

 the quarter-rack with it, and caufes it to return into its 

 original fituation : now the effeft produced by the great 

 rack, carrying the quarter-rack back, is, to occafion the 

 latter, by the aftion of its firft tooth on the little all-or-nothing 

 piece I, to bring that piece fuddenly into the fame pofition 

 it was in before the ftriking was difcharged, and thus to 

 ratfe the piece K, and confequently the hammer-tails, and to 

 difengage them from the three teeth of the great ratchet 

 that ftrike the quarters, and alfo from all the teeth of the 

 fmall ratchet, which along with the rack-pinion, all now re- 

 turn into tlicir original fituation. 



We are indebted to Mr. Bcnjnmin Lewis Vulliamy, of 

 Pall Mall, clock and watch-maker to the King and Prince 

 Regent, for this minute defcription and accompanying plate 

 of the Stocken repeater, which has never before been de- 

 fcribed, and for which, therefore, we beg to acknowledge 

 our obligation to him. 



EiUol's repeating Watch. — A new, cheap, and fimple ap- 

 paratus for repeating the hours and quarters was contrived 

 by J. M. Elliot of Aylefbury-ftrcet, Clcrkcnwcll, and pub- 

 lifticd in Nicholfon's Journal (vol. vii. 8vo. Scries, p. 157-), 

 as being applicable to either clocks or watciies. The 

 flcetches that are given in the original drawings are not cal- 

 culated to give a clear conception of the coiincftion of the 

 parts employed ; and, therefore, we have given fuch a new 

 arrangement of the figures, as we truft will enable our 

 readers to comprehend the conftruftion and adtion of 

 Elliot's mechanifm, as applied to a watch. Fig. I. of 

 Plate XL VII. of Horology, exhibits the repeating work of 

 Elliot's watch, publifhed in 1804; and _/ff j'. 2, 3, 4, and 5, 

 fhew the parts detached, with the fame letters of reference 

 as in _^^. I. In this conftruftion, the ufual apparatus of 

 wheels, pinions, chains, pulleys, and racks, arc difpenfcd 

 with ; and the afting pieces, inftead of being fpread over 

 the furface of the upper plate of the frame, are arranged 

 concentrically on the axis of the pendant, which is not 

 pufhed in, but made to turn round to the right or left, ac- 

 cordingly as the hours or quarters are required to be ftruck ; 

 either of which may precede, or one only may be ftruck, at 

 the option of the wearer. A A B, in fig. 2, is called the 

 repeating potance, Icrcwed to the upper plate at .v, in_/ff. i, 

 and bears the works furrounding the axis of the pendant 

 CD. The portion for ftriking the quarters, fccn in_/ff. 3, 

 is attached to the axis i ; but the part fcen in fig. 2, for 

 ftriking the hours, is on a tube through whicli the axis 



Vol. XXXVII. 



pafteB, fo that each part will revolve feparately ; a circum- 

 ftance not adverted to in the original defcription. The 

 quarter-fnail, S, in ^^. i, with its loofe piece, the ftar- 

 wheel and its hour-fnail H, the jumper G, and its fpring I, 

 with the dial-work Y, are fuch as we have already de- 

 fcribed. But tlie levers or detents M and N, with their 

 fprings r and /, aft here with the circular rucks on the com- 

 mon axil of the pendant, thus ; the pendant fockct D, iu 

 fig. 2, has a conneftion with the axis, feen in fig. 5, by 

 means of the pin/, on the axis, taking hold of its projcfting 

 piece a, which may be called the hour-pallet ; e is the hour- 

 locking fnail, in fgs. 2 and 4, with its projefting pin, 

 placed without or beyond the repeating potance, and fixed 

 on a focket that furrounds the axis ; on which focket alfo 

 are fixed the repeating wheel ^, and its ratchet R, with a 

 fpiral fpring, exhibited infg. 4 ; then while the tail-piece x, 

 of detent N, of the hour-fnail, falls on the proper ftep of 

 fnail e, to regulate the number of ftrokes to be made for the 

 hours, the tail-piece i, in fg. 1 , of the hammer V, is 

 caught by the doping teeth of the ftriking-wheel g, and 

 raifes the hammer under the plate of the frame, that ftrikes 

 a circular rim of fteel furrounding the works, inftead of 

 a bell ; but before thefe ftrokes will be made, the pendant 

 muft be turned round by hand gently and regularly, and 

 continued till all the blows are given ; this manual turning, 

 therefore, fuperfcdea the ncceflity of a repeating train of 

 wheelj and pinions. The ftriking mechaniTm for the quar- 

 ters is fimilar in conftruftion to that for the hours, and is 

 fecii detached in fg. 3, where / is the pallet ; m, the lock- 

 ing-fiiail, with its projefting pin to he caught by the pallet 

 in the retrograde motion of the pendant ; 0, the ratchet- 

 wheel, and n, its fpiral fpring ; and laftly, />, the contrate 

 wheel for ftriking the quarters, by means of the fecond 

 elongated hammer-tail S, while the hammer has its centre of 

 motion at Z. Thus, when the hours and quarters are both 

 ftruck by the fame hammer, as regulated by their refpeftive 

 fnails, the fpringi.w and h, connefted with the concentric 

 fnails and their ratchets, bring back the afting parts to their 

 wiginal fituations, for repeating the fame ftrokes as many 

 limes as may be wiflicd, for the purpofcs of either utility or 

 curiofity. It may be necefiary to notice further, that the 

 rim fubftituted for a bell has a notch cut into it, to admit 

 the arbor of the pendant to pafs without obllruftion ; and 

 that we give tjiis conftruftion without having feen the watch 

 itfelf, and, therefore, without making any remark on its 

 merits or demerits, further than that it apjiears to have the 

 recommendations of fimplicity and cheapnefs. 



In the fame year and month in which this watch was firft 

 defcribcd, the inventor prefented the model of another ra- 

 peating watch to the Society of Arts at the Adelphi, an 

 account of which is publiflied in the 2 2d volume of their 

 Tranfaftions, for which he received their bounty of thirty 

 guineas. We have not given a drawing of tliis fecond re- 

 peater, as being acceflible to all fcientific men properly intro- 

 duced to the Society's rooms, and particularly as the mode 

 of ufing it docs not differ from what we have juft defcribcd, 

 fo far as the rotatory motions to be given to the pendant, 

 direft and retrograde, arc concerned. In this watch the 

 fnails for the hours and quarters, the itar-wheel, dial-work, 

 jumper with its fpring, and locking detents, are nearly the 

 fame as in the other ; hut inftead of the ftriking-wheels, 

 ratchets, and fprings, being on the arbor of tlie pend.int, 

 they are jilaccd on a flat circular rim of ftcel, that revolves, 

 by means of friftion -rollers, roiind the dial-work on the fame 

 plane, to about one quarter of a revolution. This rim it 

 indented about a quarter of its cirriimference, and is adiu- 

 alcd by a beveled pinion, placed on the inner extremity of 

 5C the 



