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... GUILDFORD SURREY Enlargement of dust particles. Each division represents ten microns Micron- size Menace The internal combustion engine is dangerously vulnerable' to the abrasive action of air-borne dust. Intensely hard silica particles enter via carburettor and crankcase breather they mix with the lubricating oil and play havoc with bearings and cylinders. And the most dangerous particles are ...