of a powerful screw or hy- of high speed in belts has been long known in England and as a precautionary matier, as shown at ¢¢; but the keys draulic press. The force required is about thirty or thirty- in some parts of Europe, and many wonderful examples there must, as I have before stated, fit… … turning, and do not work loose. Plate couplings must be What Professor Willis saysin regard to American prac- chines. An adjustable coupling, to be good for anything, tice has continued to be the practice since this was written, fitted in precisely the same manner. If a plate coupling be must clamp…
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