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less, it is difficult to decide to put in costly items of equipment, dental units, etc., in
clinics which we are hoping will be replaced in the foreseeable future, and which
would be better in every way if they started off completely new. In addition, some
items like air-turbine engines have developed so rapidly since their inception that
those of the original design are almost as dated in comparison with the most recent
ones, as the electric engine was to the first generation of air turbines. Thus, the
programme of replacement of major items of dental equipment is a continuous one,
rather like repainting the Forth Bridge."
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