70 (#118) ############################################# WOOLLEN AND WORSTED SPINNING > almost equal pinning of the clothing in both count and crown direction. The distribution of the teeth in the first place may be designed as shown in Fig. 24 a, b, c, by dotting in the points of the teeth as required to scale, and then upon this dotting to add the crowns in plain, rib or twill order according to the condition judged most suitable in each particular case. In the second place the plain, rib or twill foundation crowns may be lightly sketched in to scale, and then the points of the teeth (at the two ends of crowns) dotted in strongly to clearly indicate the dis- tribution of the points of the teeth (Fig. 25 a, b, c). As a rule it is much more satisfactory for the carding engineer to design and indicate the settings he desires than merely to take what is offered to him by the card- clothing manufacturer. He should recognize, however, that the card-clothing manufacturers have a wonderfully extensive experience to draw upon, and as a rule are quite prepared to discuss the various points here raised. In the pinning of comb circles for the Noble comb it is now customary to take the diameter of the wire and the required “clear space necessitated by the quality of fibre being combed and to calculate the pins per inch accordingly. This may also be done in the case of card clothing. Taking, for example, 60's counts 6 crown, the cal- culation stands as follows :- 60's/6-Wire No. 24 (L.S.G.) = '022" diameter-144 teeth ) per sq. in. και πd2. Area (0.022) 0.00038 .00038 X 144 0.0547 wire area per sq. in. 0.9453 space per sq. in. It should be noted that the bending of the wires at the knee along with the card grinding results in the wire presenting an area, which is an ellipse, consider- 1 70
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