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ID number:441109
 
Author:
Evaluation:
Published: 20.04.2007.
Language: Latvian
Level: Secondary school
Literature: 3 units
References: Not used
Extract

Tomass Edisons izmēģināja apmēram 6000 dažādu metariālu, lai izgatavotu izturīgāku kvēldiegu.

Beidzot 1879. gadā viņš atklāja, ka visilgāk deg oglekļa kvēldiegs.

Viņš izmantoja to spuldzes izgatavošanai, un tā spīdēja vairāk nekā 13 stundu.…

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