Abstract
The hyperfine structure of a large number of mercury lines has been investigated by several observers and their results often show considerable variations, which have often been ascribed to the different modes of excitation. The line 4916Å. is one which exhibits such differences. Janicki and other early observers have described this line as single, while Hansen was the first to resolve it into five components, the satellites being quite close to the main line. Venkatesachar, using a long column of low density arc discharge, photographed a pattern which showed six or seven components. Subsequently the wave-lengths of these lines were fixed by Yenkatesachar and Sibaiya from fresh photographs taken with a number of Lummer plates, using the axial radiation from an arc discharge about a metre long. Later Tolansky, using a high frequency electrodeless discharge, reported that he failed to observe the structure recorded by Venkatesachar and Sibaiya.
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