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> Rare orig framed atlas thread form formulas chart lathe
Rare orig framed atlas thread form formulas chart lathe
This is an Atlas chart marked "Thread Forms and Formulas". Tables include:
Lower center of chart is marked "Screw threads have speeded modern industrial development. For centuries machinists and mechanics have considered the cutting of accurate screw threads one of the most important functions of the lathe. No phase of lathe operation is more interesting or practical, and no operation requires more study and care. This chart, one of a series prepared in the interest of promoting expert machine operation, is published by Technical Service, Atlas Press Company, Kalamazoo, Michigan, U.S.A. Additional copies will be mailed to any point in the United States upon receiving 15 cents in coin or stamps".
