| Show The Th advantages ad of bearings ball for fans over plain bearings was recently determined in a series of tests of a inch 35 exhaust fan so designed that it could be operated either with the plain or ball bear bear- ings When adjusted for the same volume and conditions of delivery it was found that slightly over seven per cent more power was required to operate with the bearings bearing's than than with t the le bearings ball-bearings while when adjusted for the same power in either case an increase of delivery capacity capacity capacity ca ca- of over 70 7 per cent was secured with the ball |
