क्रेस्कोग्राफ़

(aangrezi:Crescograph) kreskograf ek vaijnanik upakaran hai. kreskograf ka avishkar jagadish chandr bos dvara kiya gaya tha. kreskograf paudhoan ki vriddhi ko darshane vala yantr hai.

panne ki pragati avastha

adhar

prarambhik

madhyamik

poornata

shodh

sanbandhit lekh

a a i ee u oo e ai o au aan k kh g gh n ch chh j jh n t th d dh n t th d dh n p ph b bh m y r l v sh sh s h ksh tr jn rri rri aau shr aah