

MEMOIR OF DANIEL TREADWELL. 



499 



Let us now suppose a roving of hemp to be passed into the tunnel l, and the pulley b to be 

 turned in the direction of the arrow; the bobbins lying between the rows of hatchel- teeth must be carried 

 along with the hatchel-belt ; and as some of the bobbins, by their connection, in forming the bobbin-belt, 

 constantly pass out of the hatchel-belt on the right, so others constantly pass into it on the left. When, 

 therefore, the roving of hemp, passing into the tunnel l, meets the hatchel-points, it is pressed between 

 them by the bobbins, and passes along in the hatchel-belt until it arrives near the end f' of the rails 

 f f'. Now, as the rails pass beyond the pulley u', to the right, and as the clearers (sec Fig. 6), as has 

 been before described, pass on the top of the rails, it is evident that they will be raised upwards, upon the 

 hatchel-points; and as the roving of hemp is always above them, this also must be lifted out of those 

 points. Suppose that the end of the roving be then passed through the gatherer x, and that it be made 

 to enter between the drawing-rollers. If the drawing-rollers are now turned faster than the hatchel-belt 

 carrying the roving, the roving must be drawn out through the hatchel-points by the rollers, forming a 

 filament as much smaller than the original roving as the rollers move faster than the hatchel-belt. If, 

 however, the relative motions be constant, then these proportions will be true only when the mean size 

 of the filament is compared with the mean size of the roving ; for the roving is not supposed to be of 

 equal size throughout, and, moreover, the ends of the fibres of hemp cannot be distributed at equal dis- 

 tances in it ; hence more of these ends will be taken into the rollers together at some times than at 

 others. Now when many ends meet the rollers together, many fibres must be drawn out of the hatchel 

 together and the filament be made larger than at other places, where the ends of fibres, bj T being distrib- 

 uted in the roving at greater distances, meet the rollers less frequently. To prevent as much as possi- 

 ble this inequality in the filament, I use the apparatus now to be described, which I call the regulator 

 and the comb. 



3) 



m 



ff is made 



[u 



101. These wheels are bored with a round 



ff, 



collars from slipping in the direction of the length of the shaft. A second shaft, A A, is made to run in 

 centres upon the same frame, ee, parallel to//. The wheels i, i', are fixed firmly on the shaft hh. The 

 wheels g and %' have fifty teeth each, the wheels g' and i have seventy teeth each, and the diameters of 

 all the wheels are in proportion to the number of teeth. [In the figure, g' is drawn too large, and i too 

 small.] The teeth of g play into those of i, and the teeth of g' into those of i'. 



There are two locking-pins, or catches, k, k' (Fig. 3), fixed upon the wheels g, g'. I, I' (Fig. 10) are 

 two clutch-boxes placed upon the shaft//. These clutch-boxes are free to slide in the direction of the 

 axis of the shaft; but in the shaft are fixed pins which project into a groove cut lengthwise on the inside 

 of each clutch-box so that the clutch-box must always turn with the shaft. Several parallel grooves are 

 turned in the body of each clutch-box. A slide-bar, oo, is placed on the frame ee, parallel with the 



ff 



ft // 



minate directly over the clutch-boxes 11, that is, one arm over each clutch-box. There are fixed to the 

 under side of* each arm,jt>,p, metal blocks or boxes, q q, which pass down to the clutch-boxes. The 

 under sides of q q are formed in the shape of a hollow cylinder, and are grooved so as to embrace the 



formed 



[* 



The figure represents 



] 



// 



reason of the pin in the shaft and the longitudinal groove in the clutch-boxes, must move also, but the 

 wheels g and g', being loose on the shaft//, do not move. On each clutch-box is fixed a locking-pin, 

 m and n, and also on each of the wheels g and g' a locking-pin, k and k> ; now if these locking-pins on 

 the clutch-box and those on the wheels g and g' are brought in contact, these wheels must move with the 



// 



Now 



the clutch-boxes are connected by the two arms pp with the slide-bar o o, and are moved with it to the 



