Life, 1927-04-07 · page 4 of 59
Life — April 7, 1927 — page 4: what you’re looking at
What you’re looking at
This is **not satire or political commentary**, but rather **advertising for Ethyl gasoline** presented as educational content. The page uses two pressure-curve graphs to demonstrate a technical problem: engine "knock" (pre-ignition caused by carbon buildup in cylinders). The top graph shows irregular pressure spikes when using regular gasoline. The bottom graph shows smooth, controlled pressure when using Ethyl-treated fuel. The ad claims Ethyl gasoline eliminates knock by preventing carbon formation, delivering benefits like improved power, easier handling, reduced wear, and faster acceleration. This represents early automotive advertising strategy: using General Motors Research Laboratory photographs and scientific-looking data to establish product credibility and educate consumers about a relatively new fuel additive technology.
📄 Transcribed text from this page (OCR, searchable)
Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.
2 Life This is the knock in your motor HIS shows photographically what occurs in the engine cylinder as carbon forms, when you oper: ate your car on regular gasoline. The increased heat and pressure created by the carbon cause the gasoline to explode too quickly, with the result that there is an accumulation of high pressure waves which strike agalost the cylinder walls so violently as to produce an audible metallic sound. You know that sousd as the ‘‘knock’’—and the bumps in the line show what the ‘knock’? looks like. The “‘knock’’ is the bane of the car driver. It hurts both ear and engine. It slows up engine revolutions; au cuts down power and pick-up; increases vibration and engine wear and tear; and entails the trouble and expense of carbon removal. From a photograph by General Motors Research Laboratoria And this is how |: be ne D this shows what goes on in the same cyl- ; fo inder under the same conditi bi Tl ular gasoline is treated with Note the absence of ‘*knock-bum| the evenness of of the pressure changes. The ‘‘ETHYL"’ fluid has neutralized the heating qualities of the carbon de- flu posits and by maintaining the normal combustion f rate of gasoline has turned the increased pressure mi carbon causes into increased power. ga Ethyl gasoline is the most efficient ‘‘anti-knock’’ k fuel yet discovered. It transforms carbon from a ef liability into an asset. It produces more power on | hills and heavy roads. Speeds up acceleration. Makes for easier handling in traffic. Reduces gear shifting. Keeps out the ‘‘knock’’ with the spark pi fully advanced. And reduces wear and tear and maintenance costs. ca From a photograph by General Motors Research Laboratories comicbooks.com