99 (#151) ############################################# CARDING AND CONDENSING The calculation for the "weight per hour” is worked out as follows: (1а) бо х 24 х бо 8 X 256 42 lbs. per hour. These particulars are specially selected to bring into question the whole problem of "card-timing." ” It is quite evident that this problem has rarely been scien- tifically tackled. The possibilities are obviously so great that it is not surprising to learn that one York- shire firm refuses to allow visitors to the mill, else might the secret of how to get double the normal weights through cards become common trade know- ledge. Perhaps more important than anything else is the method of gradually increasing the severity of the carding operation from feed rollers to last doffers. All the sur- face speeds of the rollers of a card should be calculated with this end in view, and there should be no hesita- tion in ensuring this gradation. The breakage of fibre which takes place in the best carding to-day warrants a revolution in carding practice. In Fig. 90, “Wool Carding and Combing,” the driving of a carding engine is so well illustrated that there is no need to consider the matter further here. Note should be made, however, of the possibilities of chain drives throughout, experiments with Renold's chains having recently been made with this end in view. * * * * (e) Sets of Machines and their Arrangements.- Ordinary cards, say 60 in. to.72 in. wide, are arranged to pass anything from 20 lbs. per hour to 70 lbs. per hour. The conditions controlling this have already been dealt with. As a basis, 40 lbs. per hour may be taken as an average, with the qualification that this would be decreased for fine wool to be condensed to a fine count, 99
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