American School of Correspondence · Chicago, American school of correspondence · leaf 71
Some of the rigid beaters are made with tlie edges of theblades of hardened steel, but these do not wear any better than 5S *4 .y … XH X <iH b 0- a s COTTON SPINNING. 23 the ordinary ones, and become dulled about as soon, and cannotbe sharpened witliout grinding, wliich is considerable trouble,while the others can be sharpened by simply planing off the dullededges. Picking Macliinery on Different Floors. This is shown inthe…
Textile industry and fabrics
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