पुस्तक का विवरण : घिरनी (पुलि) का विचार किसी आदमी के दिमाग में तब आया होगा जब उसने भारी भार उठाने में मदद करने के लिए पेड़ की शाखा पर एक रस्सी फेंकी होगी। तब उसने पाया होगी। तब उसने पाया होगा कि ऊपर की ओर खींचने की तुलना में नीचे की ओर किसी भारी वजन को खींचकर उठाना ज्यादा आसान होगा…………….
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…….
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