TAMBOURING. 



the wheel over which it projects. At the top of 

 the pullies J is an iron axle M" (fig. 1.) sustained by 

 pivots fixed upon the great beams of the frame AC 

 and A'C' ; this axle carries, towards its extremities, 

 but inside of the frame, two toothed wheels m ; the 

 one to the left is seen in fig. 1 . the one to the right 

 is hidden by the pulley J ; its left extremity projects 

 beyond the frame, that it may carry a toothed wheel 

 M (fig. 1. and 2.). On the pulley J and on the cor- 

 responding toothed wheel m, there passes an endless 

 chain j (fig. 2.) ; that part of the chain which is to 

 pan over the circumference of the wheel m is a 

 Vaucanson-chain ; the other part which is to pass 

 over the pulley J is a plain belt ; the extremities 

 of the chain, taken as a whole, are fixed, the one 

 in/ and the other inj" (fig. 2.) on a piece m" sup- 

 ported by the extremity of the pin m' (fig. 1.) 

 which is itself fixed in the piece /, at the extremity 

 of the beam L ; this same pin bears likewise a 

 grooved wheel that runs under the shaft K. 



The result of this arrangement is, that in making 

 the axis M" (fig. 1.) or the wheel M (fig. 2.) turn 

 in the direction shown by the arrow, the carriage 

 approaches the cloth ; whilst, on the other hand, 

 it will recede from the cloth when the wheel M 

 turns in a direction contrary to the arrow. 



The carriage on the left (fig. 2.) is arranged ex- 

 actly as the carriage on the right, j ust described ; 

 the whole is similar to it, and its details are marked 

 with the same letters, observing, however, that the 

 wheel M, which is on the extremity of the axis M'' 

 agreeing with that of the second carriage, is marked 

 by the letter M' because it is necessary to distin- 

 guish the two wheels M and M', which are other- 

 wise entirely similar, and mounted in the same 

 manner. 



When one of the carriages has advanced and 

 pierced the needles into the cloth, the other is then 

 to receive them, draw them through, extend the 

 thread as it retreats, and on its return insert the 

 needles again in the cloth, through which they will be 

 drawn by the pincers of the second carriage. 



For this purpose, M. Heilmann, on the piece O 

 attached to the two supporters AC and AD of the 

 frame, has fixed a curved lever now' n" moveable 

 round the point o ; the curve or crank n bears a 

 toothed wheel O', and the extremity n' bears a 

 toofhed wheel O"; the four wheels M M', O' and 

 O ' have the same number of teeth and the same 

 diameter ; the two wheels O' and O" are fixed, the 

 one in connexion with the other, so that they are 

 able to turn the handle N (fig. 1. and 2.), and con- 

 sequently to turn the wheel O'' along with O' : 

 when the lever n o is vertical, the wheel O' neither 

 touches the wheel M nor M', but if it be inclined 

 to the one side or the other, 1t makes the wheel 

 O' catch successively the wheel M or M'. 



Referring to fig. 2. it is manifest, that if we 

 turn the handle N in the direction shown by the 

 arrow, the wheel M will also turn in the same direc- 

 tion, and the right-hand carriage will approach the 

 bar, which prevents the pincers from touching the 

 cloth. That being done, by inclining the lever n o 

 in a contrary direction, the wheel O' will catch the 

 wheel M' and, by making the handle N turn in the 

 same direction as done just now, the wheel M' will 

 turn in the same direction as the wheel M, and the 

 left-hand carriage will be thus removed to its limit 

 with a speed proportioned to the power of the 

 hand impelling the handle ; it is led back by turn- 

 ing the handle in a contrary direction, and the sim- 

 ple motion of the lever n o will be sufficient to act 



alternately, either on the right or left-hand car- 

 riage. 



The workman, however, having his hands occu- 

 pied, the one on the pantograph, the other at the 

 handle, must act with his feet on the lever n o. M. 

 Heilmann, to meet this necessity, has conveniently 

 placed two pedals, by means of which the work- 

 man executes with his feet a series of operations, 

 not less delicate and minute, than those performed 

 by the hands. Meanwhile, let us describe these 

 pedals, only as a means of putting the lever n o in 

 motion, at an appointed spot. The pedals P (fig. 

 1. and 2.) are moveable around the axes p, and 

 have the cords p' (fig. 1.) rolled on the pulleys P' 

 in a contrary direction ; these pulleys are fixed on a 

 moveable shaft P", sustained on one side in the sup- 

 port E', and on the other, in a piece K' (fig. 1 and 2.). 

 Attached to the two great supporters of the frame 

 A C and A D, (fig. 2.) the shaft P" bears, at its ex- 

 tremity, a piece represented in a front and side 

 view at No. 3; a little above and to the left of the 

 place that it occupies in fig. 1. This piece has 

 teeth over a portion of its rim, (for a purpose which 

 will be explained hereafter) ; we observe it supplied 

 with a pin fixed in the curved extremity of the 

 lever no; then it is manifest, that in lowering the 

 pedal P which is at present raised up (fig. 1.) the 

 upper part of the shaft P" (seen endwise in fig. 2.) 

 will turn from left to right, and the lever n o will 

 incline itself for the purpose of bringing the wheel 

 O' over the wheel M', but at same time the pedal 

 at present lowered will rise up, because its cord is 

 forced to roll itself on the pulley as much as the 

 other cord unrolls, so that the apparatus is in full 

 power to act in a contrary direction when neces- 

 sary. 



Arrangement of the Pincers. The beam L' (fi^. 

 1. and 2.) bears, at intervening distances of half a 

 yard, the appendages qq, which were cast in the 

 same piece with it. (See also fig. 6. where the 

 scale is larger.) It is to these appendages that 

 the curved branches Q, (fig. 1. and 2.) supporting 

 the whole mechanism of the pincers, are fixed by 

 two bolts. Fig. 6. represents only a part of these 

 branches ; but, as they are arranged in nearly the 

 same manner above and below the beam L', that 

 part, along with figs. 1 and 2. is capable of giving 

 a distinct idea of them. An iron rod, in the form of a 

 triangular prism, seen in S, (fig. 6. and 7.) is ex- 

 tended between the two consecutive branches, Q Q, 

 as seen in fig. 1. and is fixed to each of these 

 branches by means of an ear s' (fig. 6. and 7.) into 

 which a bolt passes, crossing the thickness of the 

 branch ; and, instead of a simple hole, the ear has 

 a slit, allowing it to go backward or forward. We 

 are then easily able to put successively into a 

 straight line, the three rods S, intended to be placed 

 in the three intermediate spaces of the branches Q; 

 each of which is a little prolonged beyond its two 

 ears, so that, when the complete structure is made, 

 the three consecutive rods may seem to form only 

 a triangular prism, extending from one end to the 

 other of the carriage. This prism is intended to 

 receive and carry a full row of pincers. Figs. 8, 9, 10, 

 and 11, represent the details of the construction 

 of a pincer. In T, (fig. 8.) is seen the lower jaw, 

 as set in its place, and adjusted to the prismatic 

 rod. It will readily be seen that it bears, 



1st. Below, a little to the left, a vice t, which 

 fixes it on the prismatic rod ; and to which it is 

 nearly similar in shape, at its lower end. 



2d. Directly to the left, a spring t', for propping 



