30 (#63) ############################################## BLENDING in. 1 . 46 22 heavy dirt, etc., falls. The action of the machine is so nearly allied to the card that no further description is called for save the following details of construction : Diameter on Diameter to Revolutions the wood. top of teeth. per minute. in. Feed Rollers 5 6 II3 Angle Stripper 51 71 II.3 Swift 47 180 Workers. 63 81 10:4 Strippers 51 71 10:4 Fan 251 810 The teeth are } in. pitch and intersect when possible. The teeth usually are tenter-hooks” with the excep- tion of the fan-strippers, which have around straight tooth. The production is about 1,200 lb. per hour. The speeding of the cylinders in machines of this type is a very interesting problem. Thus the speed of the main cylinder (the swift) may be decided by- 1. The speed at which it is mechanically safe to run it; or 2. The speed at which it will effect the most satisfactory disentanglement of the fibres submitted to it without undue breakage. Motor-car engines may run up to 4,000 revs. per minute, but the clutch is invariably much smaller in diameter than the cylinders in the machines under con- sideration. But probably (2) is the deciding factor here. Unfortunately few tests have so far been carried out to decide upon the most satisfactory speeds for fibre dis- entanglement (speed of wool-lock rupture). When this is done it will probably be found that the speed is well within the machine speed possibilities of any of the cylinders under consideration. Research is here obviously called for to replace the pure empiricism at present made the basis of practice. 31
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