vii (#11) ############################################# PREFACE C example of this is given in the speeding of the worker. Here there are three possibilities :- Ist, Worker to be stationary ; 2nd, Worker to run with the swift ; 3rd, Worker to run against the swift. Now, seeing that efficient carding is in part depen- dent upon the extent of swift and worker surfaces act- ing upon (i.e., passing) one another, it will be obvious that if instead of the worker retreating from the swift it advances towards it, then the surface speed of the swift may be reduced just in proportion to the increase in surface speed of the worker. And if the surface speed of the swift is reduced, the speed of the fancy may also be reduced and thus possible " throwing ” elimi- nated. But if a less carrying surface of the swift passes the doffer, less wool will be passed through the card unless the swift be more heavily charged : and if the swift be more heavily charged, then, will the workers act successfully and will the fancy "lift ” the heavier load ? All these points and many more are raised by the mere clear statement of the three possibilities of running the workers in a card ! Similarly the speeding of a porcupine in a French drawing-box may be considered under the three possibilities :- Ist, Running slower than the back rollers; 2nd, Running at the same speed as the back rollers; 3rd, Running quicker than the back rollers. vii
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