Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Permit each leaf to act as an overhanging beam
Obtain variable moment of inertia (I) in each leaf
Make M/I constant throughout the length of the leaf
Have variable bending moment (M) in each leaf

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Machine Design
Machine screws are

Slotted for a screw driver and generally used with a nut
Similar to stud
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between two parts

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Machine Design
In a hydrodynamic lubricated bearing

There is no lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing

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Machine Design
Split nut is a locking device in which

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
A slot is cut partly in middle of nut and then slot reduced by tightening screw
Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

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