How seat belt works.


Seat belt is very essential component in any vehicle regarding our safety; it holds us at time of any accident. Prevent us to strike against steering and dashboard. 
Let us understand how it works.
Standard seat belts have a retractor mechanism.
The belt webbing is connected to retractor mechanism.
The central element in retractor is spool. The central element in the retractor is a spool, which is attached to one end of the webbing. Inside the retractor, a spring applies a rotation force, or torque, to the spool. This works to rotate the spool so it winds up any loose webbing.
When you pull the webbing out, the spool rotates counter-clockwise, which turns the attached spring in the same direction. Effectively, the rotating spool works to untwist the spring. The spring wants to return to its original shape, so it resists this twisting motion. If you release the webbing, the spring will tighten up, rotating the spool clockwise until there is no more slack in the belt.
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THE WANKEL ROTARY COMBUSTION ENGINE

                             

INTRODUCTION

->The advantage of rotary motion have far long been known and appreciated,it
includes number of patent including the patent of rotary Steam Engine by James
Watt in1769.
->Scheffel in 1952,get patent for rotary engine,utilised the principle that oval or
elliptical tower can be designed to maintain contact,while turning about find centres
and that three or more rotars can to enclose between them a continously varying
volume.
->Felia Wankel(German),got a patent for design of four phase rotary engine working
on otto cycle principle.
->Later on Dr.FROEDE made the inner rotar or bit while it rotated,and permitted the
outer body to kept stationary,such simple arrangement allowed attachment of intake,
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Active Denial System (ADS)


How would be if without hurting or killing people we would able to control over un-civilized mob or anti-social elements .
It is possible The Active Denial System (ADS) a non-lethal, directed-energy weapon developed by the U.S. military to control un-wanted rage of mob.
The   weapon is also called the heat ray, since it works by heating the surface of targets, such as the skin of targeted human subjects.
 The ADS was deployed in 2010 with the United States military in the Afghanistan war
The ADS is currently only a vehicle-mounted weapon, though U.S. Marines and police are both working on portable versions
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