. X-rays simply explained : a handbook on the theory and practice of radiography . by the molecular streamas it hammers or bombards the bodies placed in itspath. The effect is one of primary generation oflight, and the colours produced, which depend on thefrequency or wave length of vibration excited in theparticular material in question, have no connectionwhatever writh the natural colour of the of the most beautiful effects are produced bymaterials which, under ordinary circumstances, areperfectly white. Diamonds do not always emit the same colour, but i:\\i\ on
. X-rays simply explained : a handbook on the theory and practice of radiography . by the molecular streamas it hammers or bombards the bodies placed in itspath. The effect is one of primary generation oflight, and the colours produced, which depend on thefrequency or wave length of vibration excited in theparticular material in question, have no connectionwhatever writh the natural colour of the of the most beautiful effects are produced bymaterials which, under ordinary circumstances, areperfectly white. Diamonds do not always emit the same colour, but i:\\i\ one mentioned by Sir W. Crookes gave a brilliantgreen light Rubies, which in their valuable form consist of red•.ils of alumina, fluoresce b deep rich crimson,even if coarse rough specimens, almost, or quitedevoid of colour, arc employed. Sir W. Crookea also found thai precipitatedalumina gave the same rich red as its aristocraticrelation and, what is more Interesting, that aftercontinued action the powder assumed a permanentpink tinge and became possessed of certain properties. Fig. 2. identical with those of crystalline alumina. Itseemed as though the continual battering andjostling rough treatment by the kathode stream, hadworried the alumina into a different moleculararrangement—had perhaps even tidied it up intoBonie degree of crystalline respectability. Dolomite, a double compound (magnesium carbonateand calcium carbonate), shines red, and has theappearance of a piece of glowing coal. Willemite (mineral silicate of zinc) gives an 111STOKICAL AND EXPL A N AlT) 11Y. 21
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectcathode, bookyear1903
