Machine Design
Slenderness ratio is the ratio of

Width of column to depth of column
Maximum size of column to minimum size of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column

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Machine Design
In hydrostatic bearings

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

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