 अखरीया से स्वेल के पागषतान ऑर लेभर पुलीसी पाकेशतान अन जर लेजीे की लेग एन फीवाग का छूँँ, लेगी पुछ़ा हो है, लेगी था अगर कि रेए च्टीम ईजिनें हर आदेदेगा च्ठी की रेवर च्टीक की पागषतानन के विउगर पिजद जो त मोदर्लीگी कीकटी। सबक्चोडए कोल मात्निग के ब्ररेटन नहीं। सबक्चोडए के थाना आप जाएिडान हो गंगिटी। कोल षिन्ँदा के बचाखा। सवरे वर आप शह़ो बेल पितु की हऽे चाहता। तुिक रहाएे थ्तिं से लिएंगने सयने च देल भी ऑरयेएँ शाथः कर क् affairs of today's ध्योल Extra के आप कोल � absurd दान्या कोल मिलामने का दिक दहाए शाखोि कोAKE मेंने वम दिपकmy Mina द्पक साज भहम 같습니다ез देपे लग तूँет आप रह मैं कुल Tina हो बहलक yarn the च 1949 N howling buckets of water up the shaft order to a tunnel driven into a hill to drain humine in either case dear students. The water had to be discharged into a stream or ditch at a level where it could flow away by gravity. अदिज at a level where it could flow away by gravity. My students the introduction of the steam pump by Thomas Savry in 1698 and the Newcomen steam engine in 1712 greatly facilitated the removal of water and enabled shafts to be made deeper, enabling more coal to be extracted. My dear students these were the developments that had begun before the industrial revolution but the adoption of John Smiton's improvements to the Newcomen engine followed by James Watt's more efficient steam engines from the 1770s reduced the fuel costs of engines making mines more profitable. We are talking about industrial revolution and we are discussing mining particularly mining of coal. Dear students the Cornish engine developed in the 1810 was much more efficient than the Watt's steam engine. Dear students as a matter of fact the coal mining was very very dangerous profession owing to the presence of fried man in many coal seams some degree of safety was provided by the safety lamp which was invented in 1816 by Sir Dewey and independently by George Stephenson. Dear students however the lamps proved a false dawn because they became unsafe very quickly and provided a weak light. My dear students the industrial revolution created a huge demand for coal to power new machines such as the steam engine in 1750 Britain was producing 5.2 million tons of coal per year. My dear students we are studying industrial revolution we are studying mining before industrial revolution or after industrial revolution and during industrial revolution Hope you have understood the topic Thank you very much indeed