262 ARMATURE CONSTRUCTION 



until the coil is the correct width and has the final form indicated 

 in Fig. 302. 



A combined winding form and spreader, designed by H. W. 

 Turner, is shown in Fig. 303. By means of this apparatus 

 three coils can be simultaneously wound, the apparatus being 

 attached to a winding lathe face-plate. The process of winding 

 with this apparatus is illustrated in detail in the photographs of 

 Figs. 333 to 339. 



A universal spreader which is adjustable for any size of diamond- 

 shaped coil, is shown diagrammatically in Fig. 304. 



Fi(i. 303. Turner's Combiued Winder and Spreader. 



The sides, i.e. the slot portions of the coils, are held in the 

 clamps b and c attached to the bars e and y. These clamps are 

 capable of adjustment longitudinally to suit coils of different 

 length. The corners of the coil are secured to clamps n n, which 

 are capable of sliding on a straight bar o. One side of the coil is 

 thus held on the fixed part of the apparatus d, and the other on a 

 movable arm h. 



The coil after winding is put into the clamps b, c, and n, the 

 bars e and g being close together. To spread the coil the arm h is 

 moved outward about the pivot / by pulling the handle piece k. 

 The clamps n n slide towards one another, and the end parts of the 

 coils a are drawn inwards, until the coil has attained the required 

 breadth. This machine may be adjusted to suit any size of coil 

 smaller than the largest coil which can be carried by altering the 

 position of the clamps b and //. 



