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

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Machine Design
In hydrostatic bearings

Do not require external supply of lubricant
The Oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication
The oil film is maintained by supplying oil under pressure

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