1836.] Method of putting music on organ barrels. 51 



round so as for the point/, and the stop g, to be in the posi- 

 tion represented in the perspective sketch fig. 4. The barrel 

 is now placed so as for the line of marks made on it by the 

 keys, and the line formed by the points of the keys in the key- 

 frame to coincide, as also for the points of the keys and their 

 respective marks on the barrel, to nearly correspond. The 

 axis of the barrel is then by the screws h, h, fig. 2, securely 

 and firmly fixed to the dividing plate, so that whatever 

 motirn the plate may have, the barrel will have the same 

 motion also. The only farther adjustment required is, that 

 the keys of the key-frame, and their corresponding marks on 

 the barrels be now made to perfectly coincide by means of the 

 two screws, a,b, fig. 3, at each end of the key frame. 



12. — In this position all is ready for transferring the music 

 to the barrel. Suppose the four divisions, to which the 

 pointer /', fig. 4, stands in the sketch, to represent four 

 crotchets, and it be required to set off on the barrel two 

 crotchets : the notes, or chords are of course to be taken from 

 the music book, and the proper keys pressed down on the 

 barrel so as to mark it ; but at starting, marks being already 

 made, we will suppose the second crotchet to be laid oft. 

 The pointer must then be removed to the next division on 

 the plate leaving the stop g, where it is, and the plate must 

 be moved downwards till the point strikes against the stop: 

 the barrel also having moved a proportional distance, the keys 

 of the notes to be transferred to the barrel are again to be 

 pressed down on the barrel, and marks again made on it, and 

 the distance of these second marks from the first, will be the 

 relative distance of the crotchet. The same process is to be 

 repeated till the whole tune is transferred. The keys on the 

 key -frame representing notes just as the keys on a piano 

 forte, or finger organ, but little difficulty is experienced in 

 laying down the music correctly, and no difficulty at all after 

 a little practice has rendered the operation familiar. A fixed 

 guide is attached to the frame, and works into the groves k 9 

 m, fig. 2, on the axis of the dividing plate, of course there- 

 fore at the commencement, that series of groves is used 

 which the music requires, that is, if it consist of single tunes 

 one of the ten separate groves is employed, but if it be conti- 

 nuous music the spiral grove is used. 



