jal ghadi

Ancient Persian clock
jal ghadi banaane ki ek saral yojana
al-jajaari ka 'gaj-ghadi'

jal ghadi (water clock ya clepsydra) ek samayamaapak yukti hai jismein samay maapan ke liye kisi drav ke niyantrit pravaah ka sahaara liya jaata hai. vibhinn sabhyataaon mein inka upayog praacheen kaal se hi ho raha tha.

baahari kadiyaaain