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156 
BOOTH PATENTS LTD.
Page 81
Page 82
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Much Park Street, Coventry.
A CCURACY, speed and cheapness -L-1 achieved through simplicity are claimed by Booth Patents Ltd. for its Easobal range of garage and workshop equipment that includes wheel balancers. There is nothing complicated about dynamic balancing, the company states, and instances: cumulative inaccuracies of tyre and wheel manufactuie and tyre fitting may result in " heavy " spots So that, although the wheel is statically balanced, these snots exert centrifugal force when revolved and endeavour to straighten the line of dynamic-couple.
The existence of such a condition of _dynamic unbalance is shown by the bubble on the Easobal spirit level "running out" when the wheel is revolved. The location of the dynamic-couple thus known to be present is indicated by the position taken up by the ball in the Dynastat indicator. Magnetic weights are thcn attached at diametrically opposite points to provide a further dynamic-pouple which counterbalances the original faults. The static balance remains undisturbed by the additions, Checking static balance is. it is suggested, as simple as handling a pair of scales; a spirit level incorporated in the balancer head is read for balance and weights are placed on the rim until the bubble is centralized. The current Easobal units are muchimproved versions of those marketed for some 10 years. There are two models, the Major W13/45D and Standard W13/15, for smaller tyres, whilst the P.S.V. Model W13145 is said to have found increasing favour among coach and commercial vehicle manufacturers and operators and tyre companies since the development of motorways.
There are adapters to tackle any type of wheel and, in addition, weights are marketed in 12-dozen packs of assorted sizes. They are the clawclip design and smaller packs with "sticks" that can be cut to required weight are also available.