Page 3 Advertisements Column 2

Timaru Herald, Volume CXXV, Issue 18200, 26 February 1929, Page 3

A MESSAGE OF VITAL INTEREST TO MOTORISTS © : ap' po-ten" ik ) The quality in a motor spirit that ensures perfect Combustion! f “ In previous announcements the reasons for adding this word “appotenic” to the motorist's vocabulary have been outlined. Here, we discuss the question of Combustion. As a motor owner, the knowledge of how ideal combustion is attained will prove of vital interest to you. * * 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 . / r This diagram shows correct combustion—with ‘Plume the abpotenic motor spirit This diagram shows incorrect combustion — U’ith motor spirit unstable to heat and high compression Plume, defying high temperatures, powerfully resisting the disrupting influences of high compressions, burns evenly and steadily. The expansion of the gas following this correctly-timed combustion delivers a powerful, thrusting push to the piston. It maintains this steady surge of power throughout the length of the power stroke, enabling your engine to deliver its full horsepower. Correct combustion follows naturally when appotenic motor spirit is used. Plume will deliver maximumppo r er without silent or audible “knock,” despite the stress of hill climbing in top gear or the heavy-load strain of low gear “plugging” through sand or mud. When you use a motor spirit that is unstable under heat and high compression, a chemical change takes place in the charge shortly after the instant of ignition. The temperature and pressure of the ignited portion “A” raises the temperature and pressure in the remainder of the charge to such an extent that it spontaneously ignites, or “goes off,” in uncontrolled combustion. ► Flames rip through the charge, hitting cylinder walls and piston, resulting in what is commonly called a “knock.” Whether this “knock” is silent or audible, the propulsive power of the charge is wasted in violent, spasmodic expansion, which the piston cannot absorb. Retarding the spark, or cutting down to second, may cut out the sound of the knock, but it is simply a case of shutting the stable door after the horse-power’s gone. The quality of crudes differs widely. Some crude* produce motor spirits unstable to heat and compression. These will spontaneously ignite at lower temperatures than Plume —the motor spirit distilled from the appotenic crude. Plume—appotenic, heatresistant —will withstand temperatures in a combustion chamber which would cause inferior motor spirits to “knock” —either audibly or silently. Our next announcement will explain the significance of the “silent knock.” Safeguard yourself! Fill up at the Plume pump ! VACUUM OIL COMPANY P™. ltd. No. 3 of a Series.

TO QUIET NERVES WITHOUT BROMIDES.

NERVOUS, EXCITABLE FOLKS FIND RELIEF IN A SAFE WAY. When Bayer discovered Aspirin and introduced it to the medical profession in 1900, they did not then realise what a blessing Bayer Aspirin would prove to millions of nervous, excitable folks throughout the world. The next time you feel unstrung, excitable, depressed, or have a nervous headache, nervous stomach, or cannot sleep, rake two tablets of genuine Bayer Aspirin any time, preferably about an hour after meals or at bedtime. You feel no ill efleets; there is no bud reaction : your nerves simply quiet down to normal again. Be sure you take only Bayer Aspirin, because the genuine does not affect the heart, derange the digestion or form a habit. All Chemists sell genuine Bayer Aspirin in boxes of 12 tablets, also bottles of 24 and 100 tablets. Bayer Aspirin costs no more than the uncertain imitations and loudly advertised substitutes, which physicians would not think of prescribing.