A " diaphragm " or " leaf " shutter ( as distinct from the simple leaf shutter above ) consists of a number of thin blades which briefly uncover the camera aperture to make the exposure.
12.
Some conventions use registers for the first few parameters, which may improve performance for short and simple leaf-routines very frequently invoked ( i . e . routines that do not call other routines and do not have to be reentrant ).
13.
A " central shutter " is not a type of shutter as such, but describes the position of the shutter : it is typically a simple leaf shutter ), and located within the lens assembly where a relatively small opening allows light to cover the entire image.
14.
Needle springs are mounted on posts screwed directly into the wooden body of the clarinet and are used for all keys other than those with extremely short pivoting axles, which continue to make use of simple leaf springs attached longitudinally to the underside of each separate key.
15.
If the vehicle does not have adequate wheel location in the vertical plane ( such as a rear-wheel drive car with Hotchkiss drive, a live axle supported by simple leaf springs ), vertical forces exerted by acceleration or hard braking combined with high unsprung mass can lead to severe wheel hop, compromising traction and steering control.
