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   krishna-agrawala Teacher
   Graduate School

   eNotes Editor

   On this earth we have just one source of natural light - that is the Sun. We do get some light from the Moon also, but the light from the moon is also sunlight reflected by the moon. Lightening from the clouds also produces some natural light, but for a very short time.

   All lights by any kind of lamp developed by human beings is artificial light. Lamps of some kind or other have been used by people for thousands of years, and with progress of technology many improvements have been made in types of lamps we use also. The Argand's is one such type of lamp in the long series of improved lamps developed and used by mankind.

   Argand's lamp was developed in 1870 by a Swiss chemistnamed Amie Argand. This lamp has a wick that is bent to form a hollow cylinder. This type of wick allows air to enter the center of the flame and results in brighter light.

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   Posted by krishna-agrawala on Wednesday July 29, 2009 at 3:39 AM