HOROLOGY. 



171 





t i 



c ile of music or gamut are marked to those notches 

 which correspond with the hammer tails, and hammers 

 intended to strike on the bells the notes so marked ; 

 but in an inverted order to the usual way in which they 

 are marked in the scales of music, the lower notes being 

 on the right hand side, and as they rise going to the left. 

 This i* done to suit the way in which the bells are 

 commonly, though not necessarily, placed in music 

 docks, (See Fig. 3.) ; for a clock-maker of any ingenuity 

 might contrive the barrel to turn any way he thought 

 proper, and place the belli to stand in the order of 

 the music scale if there was any advantage to be de- 

 rived from it. In the curved arm . J. is fixed 

 a punch f, having a very fine and sharp conical point, 

 at the distance of four inches or so from the centre of 

 the sliding socket, and not quite an inch from the outer 

 end of the flat steel piece ; the punch when appl 

 the barrel should stand upright, and directly over the 

 centre of it. This apparatus being all adjusted as we 

 have directed, it is u : ident that when the curved arm is 

 railed up a little way, the socket can then be made to 

 tide easily along the steel rod, and by this means bring 

 the outer end of the flat *teel piece very readily into any 

 notch required, and the point of the punch i* brought at 

 the same time with the greatest precision to the place of 

 the note on the barrel, leaving the flat steel pce for 

 the time in the notch: The point of the punch touch- 

 ing or resting on the barrel, a stroke from a very small 

 fc~"*r on the top of it will cause the point to make 

 a pretty deep mark or conical hole on the surface oi the 

 barrel. 



It no wrenjains to be shewn how the time or the length* 

 of the different note* are determined. Long or slow, 

 iiort or quick nou*. such as the minim and oemi-semi- 

 quavcr. are not well suited to belUmnaic, and, of course, 

 trodocadiptotnMchoMn for it ; the erot. 



the minim and demi-semi-quaver 

 r. be brought in at some part*. It may be 

 yuuiiaamiy to state, what i* pretty generally known, 

 the proportional value of the note* to one another ; 

 office it to say, that a minim is equal to two crotchets, 

 a crotchet to two quavers, a quaver to two semwqaaven, 

 and a semi-quaver to two deou-semi-quavers. The 

 time in which the barrel turn*, after striking or lift- 

 ing a hammer tail, to strike any note on a bcfl, 

 be in the same proportion with the notes, according 

 to their respective character. Let a wheel of 23O 



for naraple. be fixed on the ead of the barrel, 

 and let both be placed in the turn-bench, with the ap- 

 paratus which ha* been described : To the turn bench 



r a knee or 



is now attached a steel or braes 



bending at one end. so that it may IU into the spaces 

 01 the wheel-teeth. The tune of the Jolty YewBf Water- 

 man (See Plate (C( VI 1 1. rilf . 5.) being proposed to be 

 laid on the barrel, will, by inspection, be seen to contain 

 90 bar* of three crotchet* each, bring 60 crotchets : if 

 850, the number of the wheel is divided by 60. the 

 number of the crotchet*, we shall bare four for the 

 quotient, and ten for the remainder ; shewing that we 

 may take four teeth or space* for every crotchet, ten 

 the remaining part of it, serving a* a ran lor locking, 

 and the other pan for a run at unlocking for a tune to 

 be played. Now a* a crotchet is equal to four spaces, 

 quaver must be equal to two, and Ktm-<)U*ver equal 

 to one. In the tune proposed, the first note is r * ; 

 the curved arm i* brought to the left hand, and the 

 at steel piece put int.. that notch ; the punch is then 

 " i to mark the barrel ; and this being a semi-quaver, 



or the fourth part of a crotchet, the spring index is 

 shifted into the next space of the wheel teeth, and the 

 curved arm moved to the next note, which is G, on 

 the left hand, and the Hat steel piece bi-inii put into 

 the notch corresponding to G, the punch is made to 

 mark it on the barrel. This being a semi-quaver also; 

 the spring is shifted into the next space, and the curv- 

 ed arm moved to note A on the left ; the steel piece is 

 put into the corresponding notch, and the punch marks 

 i the barrel. A is here equal to a quaver and a 

 half; therefore the spring index must be moved over 

 three, or into the third space, and the curved arm mo- 

 ved to the next note, being B, on the left hand : the 

 steel piece being put into this notch, the note is mark- 

 ed on the barrel ; and as it is a semi-quaver, one space 

 is taken for it, and the arm moved to G. This being 

 marked, and as it is a quaver, two wiaces are taken, 

 and so on. When crotchets are marked, four space* 

 are taken after marking them. In the tune which we 

 have used, nine In-lls or notes arc all that is required ; 

 and three more, or a dozen, would give such a com- 

 pas* a* to take in almost any tune that mijjlit be re- 

 quired. In place of the spring indi\. it umiid I 

 tcr to have a (ingle threaded endless screw to work in- 

 to the wheel teeth, one tum of which would be equal 

 to a tooth or space. The arbor of die screw being 

 squared on one end, and a small handle for turnup it 

 being put on, jhere would be less danger of making 

 mistakes with the screw than with the index. On the 

 arbor of the screw there might also )>e put a hand or 

 index to point to a circular space or dial of eight or ten 

 ilililimis This would give room to make parts of a 

 turn, where great nicety i* required. After one tune 

 i* laid on the barrel, either it or the music scale must be 

 shifted a abort apace when the next one i* to be put on. 

 To shift the music scale i* perhaps the preferable way 

 of the two ; and the space* for shirting should be marked 

 on the top of one of the supports, and dose by one end 

 of the long slip of bras* ; or they might be marked on a 

 abort line drawn longitudinally on the surface of the bar- 

 rel at or towards one of the end* of it : or by inking both 

 method*, the one would *erve as a check on the oilu-r 

 The length of shifting depends on the distance between 

 the hammer tail*, and the number of tunes to be put up- 

 on the barrel. For example, if the distance between the 



tails is four-tenth* of an inch, and it i 

 posed to nut eight tunes on the barrel, then if wed. M.!,. 

 four-tenths by eight, we shall have half a tenth for the 

 length, or space to shift for each tune ; and this is ta- 

 king advantage of the whole space between the ham- 

 mar tails, a circumstance which is frequently over- 

 looked ; for where the shifts have been confined to a 

 les* pace for shifting than might have been got, 

 so much room i* lost. The distance between the ! 

 mar tail* depend* on their number, and on the 

 length of the barn I. Wr have made the distance 

 a quarter of an inch, where the number of hammers 

 were eleven, and the length of barrel about three inchea 

 and a quarter, the number of tune* put on the barrel 

 even, the space* for shifting were three hundred part* 

 of an inch or thereabout*, and where the clock of itself 

 bitted the tune. When the hammer tails are thin, a 

 number of tunes could be made to have their shifts in 

 a very short distance between the tails ; the diameter 

 of the lifting pin* must also be taken into account, be- 

 ing of some consideration where the spaces for shifting 

 are extremely limited. Although we have taken the 

 number of the wheel teeth for dividing the notes at 

 250, yet either a greater or a less number may be 



