.518 



TAMBOURING. 



handle N, to give motion to tin- Iclt hand carriage, 

 which draws the needles and inserts their point*. 



The threads are drawn out just as the carriage 

 withdraws ; but, this tension offering no elasticity, 

 there may result inconveniences. These M. Heil- 

 inann hus prevented, by applying to the carriages a 

 mechanical construction, by means of which all the 

 threads are equally pressed at the same time, by a 

 weight regulating them ; this alone remains for us 

 to explain. 



We observe, in fig. 1. a little under the pris- 

 matic rod which bears the pincers, a rod Y, ex- 

 tending from one end of the carriage to the other, 

 and even exceeding it a little at each end. This 

 shaft is borne by the pieces y, fixed on the branches 

 Q (fig. 2. and 6.), in which they turn ; at its left 

 extremity, it bears two small bars y' and w, and at 

 its right extremity a single small bar y' and a coun- 

 terpoise y", seen in fig. 2. The extremities of the 

 two small bars y 1 are joined by a somewhat thick 

 and straight wire. When the carriage comes near 

 the cloth, and before the wire can touch it, the 

 small bar w (the direction of which is seen in fig. 2.), 

 meets a peg w' (fig. 1.), leaning against it, and 

 raising it more and more ; the small bars y' y', and 

 the wire are raised at the same time, and take the 

 position represented in fig. 7- ; on the contrary, 

 when the carriage, in leaving this position, removes 

 away the cloth, the small bar w, glides in its descent 

 on the pin w, and withdraws to a certain dis- 

 tance ; after that the counterpoise y" lets fall the 

 small bars y', and drives the wire joining them, on 

 all the threads bearing the needles ; the whole process 

 then resumes the position shown in figs. 2. and 6. 



Throughout all the preceding remarks, we have 

 only had in view the upper row of the pincers and 

 needles, that the explanations might be the more 

 perspicuous. But in reference to figs. 1. and 2. 

 we gee, on both the right and left hand carriages, a 

 lower row of pincers and needles, which are mounted 

 at the lower extremity of the branches Q, exactly 

 like the rows in the upper part. The mechanism 

 opening and shutting the pincers is also the same, 

 and acts at the same time, as seen in fig. 2. 

 since there are for that row a shaft, a toothed 

 sector, and corresponding sliding rods X X. The 

 threads are also pressed by a structure altogether 

 similar to the one described above, when using the 

 letters Y y, y', w and w'. 



REMARKS ON THE MOTION OF THE MACHINE. 



The size of the designs that the machine can 

 execute, is not only limited by the extent of the 

 movements that may be given to the frame which 

 bears the cloth, but also by the number of needles 

 which it works ; for all the needles executing the 

 same design, and upon the same horizontal line, it 

 is evident that their distance ought to be a little 

 larger than the breadth of the design, without 

 which the motion of the frame would lead before 

 one needle, a portion of the cloth that had been 

 embroidered by another, and thus cause a repe- 

 tition of work. Consequently, if we wished it to 

 work with 130 needles, which would make 65 above 

 and 65 below, and that each drawing should have, 

 for example, 2-10th parts of a metre* of horizontal 

 breadth, we see that the distance of two needles in 

 juxtaposition ought to be something more than 

 2-10ths of a metre, and we would require a machine 

 having more than 65 times 2- 10th parts of a metre, 



+ The metre is n Frpnoh measure of length, containing 39 37023 

 English inches. 



or more than 13 metres in length. But the ar- 

 rangement of the mechanism of the whole does not 

 permit us to give the machine so much length, and 

 hitherto about 2 metres have been allowed for the 

 working part ; but in order to place, in this space, 

 130 needles, that is to say, 65 above and 05 below, 

 we must place them at the distance of about 4- 100th 

 parts of a metre ; which is the maximum breadth of 

 the embroideries that it may be made to execute. 

 In order to obtain larger breadths, we must dimin- 

 ish the number of the needles, and leave more space 

 between them. However, if the machine has the 

 inconvenience of being limited in the direction of its 

 breadth, it has the advantage of having no limit in 

 the direction of its length or height; it can, for 

 instance, embroider at once 130 ribbons as long as 

 we please ; in fine, it is sufficient to arrange these 

 ribbons on two rolling instruments, and at once 

 embroider the whole height that the vertical motion 

 of the frame can allow. The workman then puts 

 a mark at the point where he stopped on the table, 

 and for an instant stops the machine, to roll the 

 embroidered part on one of the rollers, and bring a 

 new surface before the needles. He causes the 

 point of the pantograph to go up or come down, 

 according as he has stopped above or below ; and 

 in the same manner causes the design that he 

 pictures out on the table to go up or down ; and 

 with a little art, he readily finds out the mark to 

 go on with the work. The workman should not 

 follow with the pantograph over the markings of 

 the design on the table, but he should stop the 

 point of that instrument on the spot of the drawing 

 through which the needle is to enter. He ought to 

 carry it back, and stop it anew on the spot through 

 which the needle is to spring up again, or re-enter 

 while returning from the other side, and thus in 

 succession. 



To facilitate this object, the drawing on the 

 picture is composed of three narrow lines, termi. 

 nated by the spots of the needles' entrance and re- 

 turn, so that the workman has always before him 

 the series of broken lines that he ought to follow 

 with the point of the pantograph; as, if he should 

 happen to leave that tract for an instant without 

 having left a token to mark the spot where he has 

 reached, he has to look at the stuff already done, 

 and so comparatively find out the spot where he 

 ought to resume his work, so as to occasion no 

 blank, or to go over the same grounds a second 

 time. 



REFERENCES TO PLATE LXXXVI1I. 



ABCD, fig. 1. the front end of the frame 



A'B'C'I>, the back end of the frame. 



A", fig. 1. lower cross beams uniting the feet of the two ends of 



the frame. 



a, the six feet of the front end of the frame, 

 a", the six feet of the back end of the frame, 

 a", fig. 1 . buttresses uniting the cross beams A" to the prr- 



pendicular posts of the frame. 

 B", fig. 1. handle of the pantograph. 

 bb'W, three of the angles of the pantosraph. 

 c. point of the 6 I/' on which the tracer is fixed. 

 C , (fig. 2 ) tracer of the pantograph. 

 D", cross beam, in form of a gutter, which unites the upper 



parts of the frame. 



rf, fixed point around which the pantograph turns. 

 K, table on which the design to be embroidered is put. 

 E , support of the table. 



e, cord attached by one end to the side b c of the pantograph. 



passing- over a return pulley, and carrying a weight at 

 the other end. 



f, iron spindle by which the table E is bound to its support E'. 

 E", fig. 3. grooved rail fixed to the side F of the frame. 



e". spfindle (or rod) fixed upon the cross beam IX' and working 



in the grooved rod (or rail E". 

 FF, figs. I 2. and 3. vertical beams for post*) of the frairo 



which bears the cloth. 

 F F , horizontal sides of the same SnMM. 



