HOROLOGY. 



173 



PLATE 

 K ,-. i. 



** and ten edge view of one of the counter-springs. 



_ > is a side view of one of the bell studs, which are alto 

 screwed on the upper side of the hammer frame : an 

 edge view is seen at ff. Fig. 4. g. g, g, g are edge 

 views of the bells, e. g, Fig. 4, is a side view of one 

 of them as fixed to" its stud. In some sir si clocks, 

 in place of the barrel being made to shift for change at 

 tune, the hammer frame is made to shift, carrying 

 with it all the hammers and bells. The change or 

 shifts of the barrel, is either done by hand or by the 

 clock itself. The mechanism for this commonly con- 

 sots of a wheel fixed on a steel arbor, on the square of 

 which hand is put, which points to the name or num- 

 ber of the tune marked on a small dial, at which the 

 barrel for the moment stands. The diameter of this 

 wheel is about one inch and a half, and sometimes 

 not* or less. The rim is a strong and thick hoop or 

 eontrate form, having as many steps on it as there are 

 tunes set on the barrel, the Might of the steps being 

 equal to the space from one tuns to another. On these 

 steps rest the kneed end of a double lever about four 

 inches long, whose centre of motion is in the middle, 

 and is either upon strong pivots ran into s kind of frame, 

 or upon a stoat pin, which goes through the lever and 

 the brass atod in which the lever moves. The other end 

 of the lever bears on UM end ct on* of the pivots of the 

 in> -K barrel which i* urc*-* 1 *! vrpt it t>\ 

 a pretty smart steel spring, acting against UM end of 

 the opposite pivot. Cunmntjic with the hoop-wheel, 

 and bed on the asm* arbor, is a star-wheel of a 

 number aotwrHing with the steps on the hoop-wheel, 

 a jumper with a pretty strong spring works into 

 the star wheel, by which means the barrel is kept 

 always to iu place, by the lever bearing at one place 

 on every step. Although the Figures which have 

 been given to represent the hammer frame, hammer*. 

 springs, and counter-springs, bell studs, and bells of 

 music striking, an not exactly like those which are 

 cosssBssUy made to strike quarter* hi docks, yet they 

 are equally well calculated for the purpose ; only the 

 niks of the sininsi tails need not be so far from 

 their centre of motion, beinar less connned by the pins 

 in the quarter barrel, which an fewer in nnssbn than 

 those en a lisas! L barrel. A quarur ban*) need not 

 be mnch in diameter, if five qoarters ara only to be pot 

 on it. I ftra is isrtsmded lobe put on, then the diame- 

 ter should be doable Uut of the other. 



After having dsseribsd the method of I 

 the tunes on s nmssc atonV harwl it m * v b* 



to explain the method of putting on the 

 I 1 s dock quarter or chime barrel. Hot, sim- 

 ple ss it i, we conceive it will be both 

 the general reader, and acceptable to 

 toay not be us the hstnt ef contrrrwig war 

 r who may not have had an nauniHunitj ef seeing it 



^t-u-j ~t l^ssriars are coesmonty struck on a set of eight bell*. 

 Jf,lV , fr-m U, <i in oct-v,. or they may I- nu.nUre.1 . ... 



uw qowtm * A* on to $. The 



ters are put on tk 



this instance only by tve en the barrel. Take a wheel 



cut into SO teeth not rounded ef, and 



nsrariiy on the end of the barrel; provide sn inde*. 



and a piece of brass bent so i 



whsnnitWtawnbendi.mtheaissiiit'efsiiliiighliBin, 



and the index spring tight in the teeth ; take a point, 



d TS^> a WigU trace across tk* cirri., which com. 



spends to high G or No. 1, then move the index a tooth, 



in the direction the quarter barrel turns when moved L'himet and 

 by the wheel work ; make a trace across the circle in- ^J^*"_s 

 tended for the second hammer, and so on. When the ""Y~~ 

 eighth circle has been marked, move the index two 

 teeth for the first hammer of the succeeding quarter, 

 and so on till the whole is completed ; the barrel may 

 then be drilled and pinned accordingly. Should the 

 intervals between the quarters be thought too little 

 for locking, the wheel, in place of 50, may be cut 55, 

 and this will allow three teeth in place of two for the 

 intervals. G, A, B, C, D, E, F, G, may also be repre- 

 sented by the figures I, S, 3, 4, 5, 6, ?, and 8. No. 1. 

 being the high G, and S. the low G. The changes 

 given in the following set of chimes or quarters, will 

 exhibit how to proceed in putting them on the barrel, 

 after what has been already said. 



A tet of Chimes for Clock Quarters ; tJie barrel making 

 /M>o rewluliunt in the hour. 



Ut 



Chime* for 

 dock quar- 

 ter*. 





With the number of 8 bells and hammers for the 

 quarters of a chiroe or quarter clock, a great variety 

 may be produced ; and where it may be preferred to 

 have the chime or quarter barrel to make one revolu- 

 tion lot the ten quarter* which are given in the course 

 of every hour, we shall give a specimen of a set of 

 which may be put on such a barrel. 



A MttfCiiimttfar Clock Qumrler Bfrrrlt, nkieh male 

 one remimlio* in an hour. 



r, M . ih 7th 



'h~ ^J-i*.av-r- : 1-f-fa=T:-f J f-r--i^ 



sfefeiSPI^^g 



T(h 



Mi 





