Machine Design
The buckling load will be maximum for a column, if

One end of the column is clamped and the other end is free
Both ends of the column are clamped
One end of the column is hinged and the other end is free
Both ends of the column are hinged

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Machine Design
Form coefficient of spring is

Its capability of storing energy
Concerned with strength of wire of spring
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

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