Book Title: Shu Vidyut Sachit Teukay Che
Author(s): Mahendramuni
Publisher: Anekant Bharati Prakashan

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Page 69
________________ ૯. બલ્બની વીજળીના ગોળાની પ્રક્રિયા ઇલેક્ટ્રિક બલ્બ જેને incandescent lamp કહેવાય છે, તે શું છે? કેવી રીતે બને છે? એની શું પ્રક્રિયા છે? એમાં શૂન્યાવકાશ છે કે નહીં, એમાં ઑક્સિજન છે કે નહીં? એમાં ‘ઇનર્ટ ગેસ' (નિષ્ક્રિય વાયુ) શા માટે ભરવામાં આવે છે? વગેરે વગેરે ઘણા પ્રશ્નોની સ્પષ્ટ સમજ જરૂરી છે. નીચે લખેલી ઇન્ટરનેટથી મળેલી સામગ્રીમાં આ બધા પ્રશ્નો વૈજ્ઞાનિક દૃષ્ટિએ બહુ જ સ્પષ્ટ સમજાવ્યા છે. એટલે એને અહીં અમે જેમ છે તેમ જ અંગ્રેજીમાં આપીએ છીએ પછી એનો પૂરો અનુવાદ આપ્યો છે. 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 molds 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. Jain Educationa International 56 For Personal and Private Use Only www.jainelibrary.org

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