could well then. turn then' attention to the matter of dirty exhausts.
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Dr. C. 0. S. Blyth Brooke (medical officer of health, Finsbury) had been gratified by the response received when he had reported bad cases to fleet-owners. -Ass•--g.:: result of .71 letters written in years, 43 had replied appreciatively, some expressing thanks, and seven had stated that they made regular cheeks on the situation.
The British oil engine was the cleanest diesel in the world wherever you went, said Mr. G. J. Waring, development and proving engineer, Leyland Motors, Ltd. There was only one means of achieving " vehicle decency," and . that was by manufacturers issuing a certificate to the effect that the unit complied with agreed. standards of cleanliness.
Mechanical Chart, Wanted. • The ParliamentarySecretary to the Ministry' had said . that a kind of mechanical Ringelmann Chart was required which could be pointed at a vehicle; observed Mr; Lister. He .thoOght that the community would be' waiting a long time for such a miracle instrument. If the police could send offenders to -. testing Stations it would be a strong deterrent. An owner would realize that he would have both vehicle and driver' off the road, at least whilst the test was in progress. The problem had to betackled at the source:sahe -engine, for. there was no other sobree.
• The makers had. recently asked for regulations to prevent their vehicles being overloaded. " What a state of affairs when makers have to ask the Government to protect them from their customers," commented Mr. I ister.