258 



EMBROIDERING MACHINE 



the teeth of one of them being inclined in the opposite direction to those of the other. 

 Besides the system of lower beams, there is another of two upper beams, which is how- 

 ever but imperfectly seen in the figure, on account of the interference of other parts 

 in this view of the machine. One of these systems presents the web to the inferior 

 needles, and the other to the upper needles. As the two beams are not in the same 

 vertical plane, the plane of the web would be presented obliquely to the needles were 

 it not for a straight bar of iron, round whoso edge the cloth passes, and which 



re.iders it vertical. The piece is kept in tension crosswise by small brass templets. 

 to which the strings g" are attached, and 1-y which it is pulled towards the sides of 

 the frame ?. It remains to show by what ingenious means this frame maybe shifted 

 in every possible direction. J\I. ]Ieilmann L.:s employed for this purpose the panto- 

 graph which draughtsmen use for reducing or enlarging their plans in determinate 

 proportions. 



b b'f" b" (fig. 824) represent a parallelogram, of which the four angles b, '/,/', '/', 

 are jointed in such a way that they may become very acute or very obtuse at 



