Page 10 Advertisements Column 3

Sun (Auckland), Volume III, Issue 765, 11 September 1929, Page 10

M are Sensitive than the human earl This Machine tests motor spirits for their anti - knock value The Midgley cine Fin knocktesting set. This wonderful apparatus. standard equipment with motor fuel engineers for the purpose of testing the knockresistance of motor spirits. Is the only one of its kind in the Southern Hemisphere. m pi mm Ms • It records even the “silent knock” The Midgley Bouncing Pin knock-testing set is recognised throughout the world by fuel engineers as the standard equipment for determining the anti-knock value of a fuel. The set illustrated above forms part of the extensive fueltesting equipment in the laboratory of the Vacuum Oil Company Pty. Ltd. By this scientific apparatus the remarkable anti - knock quality of Plume is regularly tested and confirmed. If motor spirit tested in this device has a tendency to knock, the bouncing pin will detect it even although it be inaudible to the human ear. Even the slightest disruption or increase in the burning rate of the fuel is indicated by a tell-tale sign on the instrument board. There is no indication of even a silent knock with appotenic Plume. The unequalled results achieved in this scientific test with appotenic Plume is a Perfect knock-proof combustion follows naturally when appotenic Plume is used. convincing demonstration of the appotenic story. It is a matter of scientific record that Plume does not knock either audibly or silently. This is due to its remarkable ability to withstand the heat and high compression of the combustion chamber. Prove the appotenic quality in your own car. Get the benefit of the full power output of appotenic Plume, made available through perfect knock-proof combustion. appotenic [from Latin: ad (ap) meaning added to: and potens, meaning powerful] possessing increased power; said of a gas that , being stable to heat and high compression will therefore neither audibly nor silently “knock” in a high compression engine. PLUME appotenic *Motor Spirits appotenic Plume is pure, uniform, crystal-clear. Your eye can see how pure it is ... Let your car prove its power. VACUUM OIL COMPANY PTY.LTD.