Truemors
"GRINDING THE CYLINDERS OF A STANDARD 'SIX' ENGINE
Each cylinder in a high-grade engine must be ground exactly true both as to size and direction. It must not depart more than one ten-thousandth of an inch from standard size. Note the emery wheel in the fourth cylinder from the left. In a six-cylinder car, each piston makes 6,000 trips through its cylinder for every mile traveled."
Photographer Unknown
(These outstanding historic photographs are from a 1923 National Geographic article entilted: 'The Automobile Industry - An American Art That Has Revolutionized Methods in Manufacturing and Transformed Transportation')
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