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तुलसी प्रज्ञा अंक 121 के बाद.
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9. ara ant ufchell -
इलेक्ट्रीक बल्ब जिसे 'incandescent lamp' कहा जाता है। क्या है ? कैसे बनता है ? उसकी क्या प्रक्रिया है ? उसमें शून्यावकाश है या नहीं ? उसमें ऑक्सीजन है या नहीं ? उसमें 'इनर्ट गैस' (निष्क्रिय वायु) क्यों भरी जाती है ? आदि आदि प्रश्नों को स्पष्ट समझना जरूरी है। निम्नलिखित इण्टरनेट से उपलब्ध सामग्री में ये सारे प्रश्न वैज्ञानिक दृष्टि से बहुत स्पष्ट किए गए हैं कि इसलिए इन्हें यहां अविकल रूप से हम अंग्रेजी में ही उद्धृत कर रहे हैं और फिर इसका पूरा अनुवाद दिया गया है :
How are incandescent light bulbs made? —SU
The glass enclosures are made from a ribbon of hot glass that's first thickened and then blown into moulds to form the bulb shapes. These enclosures are then cooled, cut from the ribbon, and their insides are coated with the diffusing material that gives the finished bulb its soft white appearance.
The filament is formed by drawing tungsten metal into a very fine wire. This wire, typically only 42 microns (0.0017 inches) in diameter is first wound into a coil and then this coil is itself wound into a coil. The mandrels used in these two coiling processes are trapped in the coils and must be dissolved away with acids after the filament has been annealed.
The finished filament is clamped or welded to the power leads, which have already been embedded in a glass supporting structure. This glass support is inserted into a bulb and the two glass parts are fused together. A tube in the glass support allows the manufacturer to pump the air out of the bulb and then reintroduce various inert gases. When virtually all of the oxygen has been eliminated from the bulb, the tube is cut off and the opening is sealed. Once the base of the bulb has been attached, the bulb is ready for use.
What types of gas are used in light bulbs and how do their effects differ? - SF, Westfield, (NJ)
क्रमशः
The glass envelope of an incandescent bulb can't tungsten is flammable when hot and would burn
तुलसी प्रज्ञा जनवरी-मार्च, 2004
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contain air because if there were oxygen
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