The London, Edinburgh and Dublin philosophical magazine and journal of science . is attached a circle-scale of great accuracy which is readoff with two microscopes. Another circle-scale of smallerweeuracy allows the approximate turning of the crystal in,the desired position. * Bragg, X-Rays and Crystal Structure. Precision-measurements in the X-Ray Spectra. 603 To separate the high vacuum in the X-ray tube from thelow vacuum in the spectrograph a gold-beaters skin withred paper, an aluminium foil or some other foil was pressedover the slit. Fig. %. Great care was taken to obtain an accurate ad
The London, Edinburgh and Dublin philosophical magazine and journal of science . is attached a circle-scale of great accuracy which is readoff with two microscopes. Another circle-scale of smallerweeuracy allows the approximate turning of the crystal in,the desired position. * Bragg, X-Rays and Crystal Structure. Precision-measurements in the X-Ray Spectra. 603 To separate the high vacuum in the X-ray tube from thelow vacuum in the spectrograph a gold-beaters skin withred paper, an aluminium foil or some other foil was pressedover the slit. Fig. %. Great care was taken to obtain an accurate adjustment ofslit, crystal, and plate, for which purpose special apparatuswere constructed and built. A great deal of the work has been devoted to the con-struction of an effective X-ray tube for spectral purposes in 2T2 604 Dr. Mamie Siegbahn on tbe region of tbe long waves. Many types have been builtand tried, of metal and glass and combinations of with cold and with hot cathodes (Wehnelt and hotwire) have been compared. The definite type which resultedfrom these investigations is to be seen in fie:. 2. This tube is entirely of metal with a wolfram spiral in acylindrical cathode. Only the anticatbode is isolated bymeans of a glass tube. Cathode and anticatbode can easilybe detached when necessary. The wolfram spiral is sub-stituted in a moment. By screwing the cylindrical cathodeup or down the focus-spot can be varied from the size of amillimetre to the entire anticatbode face. To allow continuous work both cathode, anticatbode,
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
