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This item was about the brochure published by Department of Post. This brochure was published on 02-12-2008 for 500 paise. 4 lakh copies of this brochure were published to commemorate the centenary of the discovery of "Evershed Effect". It provides a brief detail about the "Evershed Effect".

Evershed, John

This item was about the high resolution line sketch spectra captured by John evershed during his experiment at Kodaikanal Observatory. While experimenting, he came across to capturing the high resolution spectra of Altair, Nova Aquila, Arcturus in the observatory. In this sketch, he pictured the resolution spectra that he observed as Umbra for high resolution and Penumbra for low resolution.

Evershed, John