Hey Pragya,
                Spinning jenny is a form of spindle, constituting a multi-frame. It was first used in weaving in industrial revolution, which I'm sure you are aware of ;) 
Plz can u tell where is the inbox option i didn't found it:-(
Well Sure, why not. Umm do you see a message box icon on the top? like just at the left hand side of your profile picture?
Mark as the best if you can :)
Well im using brainly. in and are u using brainly. com?
Sorry but i think that monlisa's answer is more useful than yours..