घिरनी (पुली) : हिंदी पीडीऍफ़ पुस्तक – बच्चों की पुस्तक | Ghirni (Puli) : Hindi PDF Book – Children’s Book (Bachchon Ki Pustak)
Pustak Ka Vivaran : Ghirani (Puli) ka vichar kisi aadmei ke dimag mein tab aaya hoga jab usane bhari bhar uthane mein madad karne ke liye ped ki shakha par ek rassi phenki hogei. Tab usane paya hogi. Tab usane paya hoga ki oopar ki or kheenchane ki tulana mein neeche ki or kisi bhaai vajan ko kheenchakar uthana jyada aasan hoga…………….
Description about eBook : The idea of a pulley may have come to a man’s mind when he threw a rope on a tree branch to help him lift a heavy load. Then he would have found it. Then he would have found that it would be easier to pull a heavy weight downwards than to pull it up…….
